21121221120102 has 48 divisors (see below), whose sum is σ = 45963800522640. Its totient is φ = 7009461919296.

The previous prime is 21121221120101. The next prime is 21121221120137. The reversal of 21121221120102 is 20102112212112.

21121221120102 is a `hidden beast` number, since 211 + 212 + 21 + 120 + 102 = 666.

It is a super-2 number, since 2×21121221120102² (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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121221120101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234731773 + ... + 234821735.

It is an arithmetic number, because the mean of its divisors is an integer number (957579177555).

Almost surely, 2^{21121221120102} is an apocalyptic number.

21121221120102 is an abundant number, since it is smaller than the sum of its proper divisors (24842579402538).

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

21121221120102 is a wasteful number, since it uses less digits than its factorization.

21121221120102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147157 (or 147154 counting only the distinct ones).

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

Adding to 21121221120102 its reverse (20102112212112), we get a palindrome (41223333332214).

The spelling of 21121221120102 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred two".