21021012102102 has 16 divisors (see below), whose sum is σ = 42049246748592. Its totient is φ = 7005800276640.

The previous prime is 21021012102023. The next prime is 21021012102109. The reversal of 21021012102102 is 20120121012012.

It is a super-4 number, since 4×21021012102102⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021012102109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300901513 + ... + 300971364.

It is an arithmetic number, because the mean of its divisors is an integer number (2628077921787).

Almost surely, 2^{21021012102102} is an apocalyptic number.

21021012102102 is an abundant number, since it is smaller than the sum of its proper divisors (21028234646490).

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

21021012102102 is a wasteful number, since it uses less digits than its factorization.

21021012102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601878703.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021012102102 its reverse (20120121012012), we get a palindrome (41141133114114).

The spelling of 21021012102102 in words is "twenty-one trillion, twenty-one billion, twelve million, one hundred two thousand, one hundred two".