21221120121102 has 96 divisors (see below), whose sum is σ = 51228867156480. Its totient is φ = 6293495564160.

The previous prime is 21221120121083. The next prime is 21221120121137. The reversal of 21221120121102 is 20112102112212.

21221120121102 is a `hidden beast` number, since 212 + 211 + 20 + 121 + 102 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 227699149 + ... + 227792327.

It is an arithmetic number, because the mean of its divisors is an integer number (533634032880).

Almost surely, 2^{21221120121102} is an apocalyptic number.

21221120121102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221120121102 is an abundant number, since it is smaller than the sum of its proper divisors (30007747035378).

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

21221120121102 is a wasteful number, since it uses less digits than its factorization.

21221120121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117718 (or 117715 counting only the distinct ones).

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

Adding to 21221120121102 its reverse (20112102112212), we get a palindrome (41333222233314).

The spelling of 21221120121102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, one hundred two".