21012203102 has 16 divisors (see below), whose sum is σ = 34386508800. Its totient is φ = 9550194840.

The previous prime is 21012203071. The next prime is 21012203129. The reversal of 21012203102 is 20130221012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284099 + ... + 350337.

It is an arithmetic number, because the mean of its divisors is an integer number (2149156800).

Almost surely, 2^21012203102 is an apocalyptic number.

21012203102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012203102 is a deficient number, since it is larger than the sum of its proper divisors (13374305698).

21012203102 is a wasteful number, since it uses less digits than its factorization.

21012203102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80671.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21012203102 its reverse (20130221012), we get a palindrome (41142424114).

The spelling of 21012203102 in words is "twenty-one billion, twelve million, two hundred three thousand, one hundred two".