21231202102 has 16 divisors (see below), whose sum is σ = 34790994000. Its totient is φ = 9636927840.

The previous prime is 21231202051. The next prime is 21231202133. The reversal of 21231202102 is 20120213212.

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, 664977 + ... + 696172.

It is an arithmetic number, because the mean of its divisors is an integer number (2174437125).

Almost surely, 2^21231202102 is an apocalyptic number.

21231202102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231202102 is a deficient number, since it is larger than the sum of its proper divisors (13559791898).

21231202102 is a wasteful number, since it uses less digits than its factorization.

21231202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361871.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21231202102 its reverse (20120213212), we get a palindrome (41351415314).

The spelling of 21231202102 in words is "twenty-one billion, two hundred thirty-one million, two hundred two thousand, one hundred two".