21001202102 has 16 divisors (see below), whose sum is σ = 32269594320. Its totient is φ = 10247269248.

The previous prime is 21001202099. The next prime is 21001202129. The reversal of 21001202102 is 20120210012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633383 + ... + 665714.

It is an arithmetic number, because the mean of its divisors is an integer number (2016849645).

Almost surely, 2^21001202102 is an apocalyptic number.

21001202102 is a deficient number, since it is larger than the sum of its proper divisors (11268392218).

21001202102 is a wasteful number, since it uses less digits than its factorization.

21001202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299295.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001202102 its reverse (20120210012), we get a palindrome (41121412114).

The spelling of 21001202102 in words is "twenty-one billion, one million, two hundred two thousand, one hundred two".