21122122012220 has 24 divisors (see below), whose sum is σ = 44771002550064. Its totient is φ = 8369887600256.

The previous prime is 21122122012219. The next prime is 21122122012247. The reversal of 21122122012220 is 2221022122112.

It is a super-2 number, since 2×21122122012220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21122122012192 and 21122122012201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4935073097 + ... + 4935077376.

It is an arithmetic number, because the mean of its divisors is an integer number (1865458439586).

Almost surely, 2^{21122122012220} is an apocalyptic number.

21122122012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122122012220 is an abundant number, since it is smaller than the sum of its proper divisors (23648880537844).

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

21122122012220 is a wasteful number, since it uses less digits than its factorization.

21122122012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9870150589 (or 9870150587 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122122012220 its reverse (2221022122112), we get a palindrome (23343144134332).

The spelling of 21122122012220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, twelve thousand, two hundred twenty".