21011221121022 has 24 divisors (see below), whose sum is σ = 49662886286520. Its totient is φ = 6367036703280.

The previous prime is 21011221120997. The next prime is 21011221121171. The reversal of 21011221121022 is 22012112211012.

21011221121022 is a `hidden beast` number, since 210 + 1 + 1 + 221 + 1 + 210 + 22 = 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 = 21011221120986 and 21011221121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53058638997 + ... + 53058639392.

It is an arithmetic number, because the mean of its divisors is an integer number (2069286928605).

Almost surely, 2^{21011221121022} is an apocalyptic number.

21011221121022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011221121022 is an abundant number, since it is smaller than the sum of its proper divisors (28651665165498).

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

21011221121022 is a wasteful number, since it uses less digits than its factorization.

21011221121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106117278408 (or 106117278405 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21011221121022 its reverse (22012112211012), we get a palindrome (43023333332034).

The spelling of 21011221121022 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-two".