21122210221020 has 120 divisors (see below), whose sum is σ = 66293285091264. Its totient is φ = 5629858210944.

The previous prime is 21122210221003. The next prime is 21122210221027. The reversal of 21122210221020 is 2012201222112.

It is a happy number.

21122210221020 is a `hidden beast` number, since 211 + 2 + 2 + 210 + 221 + 0 + 20 = 666.

It is a super-2 number, since 2×21122210221020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21122210220984 and 21122210221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122210221027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 182002 + ... + 6502118.

Almost surely, 2^{21122210221020} is an apocalyptic number.

21122210221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122210221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33146642545632).

21122210221020 is an abundant number, since it is smaller than the sum of its proper divisors (45171074870244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122210221020 is a wasteful number, since it uses less digits than its factorization.

21122210221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322201 (or 6322190 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21122210221020 its reverse (2012201222112), we get a palindrome (23134411443132).

The spelling of 21122210221020 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred ten million, two hundred twenty-one thousand, twenty".