21012210102 has 32 divisors (see below), whose sum is σ = 45265167360. Its totient is φ = 6464138400.

The previous prime is 21012210049. The next prime is 21012210113. The reversal of 21012210102 is 20101221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482299 + ... + 524057.

It is an arithmetic number, because the mean of its divisors is an integer number (1414536480).

Almost surely, 2^21012210102 is an apocalyptic number.

21012210102 is an abundant number, since it is smaller than the sum of its proper divisors (24252957258).

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

21012210102 is a wasteful number, since it uses less digits than its factorization.

21012210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48228.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012210102 its reverse (20101221012), we get a palindrome (41113431114).

It can be divided in two parts, 2101221010 and 2, that added together give a palindrome (2101221012).

The spelling of 21012210102 in words is "twenty-one billion, twelve million, two hundred ten thousand, one hundred two".