21021102210102 has 16 divisors (see below), whose sum is σ = 42043295669760. Its totient is φ = 7006852195112.

The previous prime is 21021102210071. The next prime is 21021102210103. The reversal of 21021102210102 is 20101220112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021102210103) 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, 45218202 + ... + 45680717.

It is an arithmetic number, because the mean of its divisors is an integer number (2627705979360).

Almost surely, 2^{21021102210102} is an apocalyptic number.

21021102210102 is an abundant number, since it is smaller than the sum of its proper divisors (21022193459658).

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

21021102210102 is a wasteful number, since it uses less digits than its factorization.

21021102210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90937467.

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

Adding to 21021102210102 its reverse (20101220112012), we get a palindrome (41122322322114).

The spelling of 21021102210102 in words is "twenty-one trillion, twenty-one billion, one hundred two million, two hundred ten thousand, one hundred two".