21012020022102 has 64 divisors (see below), whose sum is σ = 43781659729920. Its totient is φ = 6716900563200.

The previous prime is 21012020022101. The next prime is 21012020022139. The reversal of 21012020022102 is 20122002021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012020022101) 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, 258177888 + ... + 258259260.

It is an arithmetic number, because the mean of its divisors is an integer number (684088433280).

Almost surely, 2^{21012020022102} is an apocalyptic number.

21012020022102 is an abundant number, since it is smaller than the sum of its proper divisors (22769639707818).

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

21012020022102 is a wasteful number, since it uses less digits than its factorization.

21012020022102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99269.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012020022102 its reverse (20122002021012), we get a palindrome (41134022043114).

The spelling of 21012020022102 in words is "twenty-one trillion, twelve billion, twenty million, twenty-two thousand, one hundred two".