21021121122102 has 24 divisors (see below), whose sum is σ = 45547275097584. Its totient is φ = 7006807656144.

The previous prime is 21021121122077. The next prime is 21021121122109. The reversal of 21021121122102 is 20122112112012.

21021121122102 is a `hidden beast` number, since 21 + 0 + 211 + 211 + 221 + 0 + 2 = 666.

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 (21021121122109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18835698 + ... + 19920485.

It is an arithmetic number, because the mean of its divisors is an integer number (1897803129066).

Almost surely, 2^{21021121122102} is an apocalyptic number.

21021121122102 is an abundant number, since it is smaller than the sum of its proper divisors (24526153975482).

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

21021121122102 is a wasteful number, since it uses less digits than its factorization.

21021121122102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38786324 (or 38786321 counting only the distinct ones).

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

Adding to 21021121122102 its reverse (20122112112012), we get a palindrome (41143233234114).

The spelling of 21021121122102 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred two".