21121010220222 has 64 divisors (see below), whose sum is σ = 51255400204800. Its totient is φ = 6393687229440.

The previous prime is 21121010220161. The next prime is 21121010220227. The reversal of 21121010220222 is 22202201012112.

It is a happy number.

21121010220222 is a `hidden beast` number, since 2 + 1 + 1 + 210 + 10 + 220 + 222 = 666.

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 = 21121010220195 and 21121010220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121010220227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17810947 + ... + 18959742.

It is an arithmetic number, because the mean of its divisors is an integer number (800865628200).

Almost surely, 2^{21121010220222} is an apocalyptic number.

21121010220222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121010220222 is an abundant number, since it is smaller than the sum of its proper divisors (30134389984578).

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

21121010220222 is a wasteful number, since it uses less digits than its factorization.

21121010220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36771678 (or 36771672 counting only the distinct ones).

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

Adding to 21121010220222 its reverse (22202201012112), we get a palindrome (43323211232334).

The spelling of 21121010220222 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, two hundred twenty thousand, two hundred twenty-two".