21021001202102 has 24 divisors (see below), whose sum is σ = 34669354373136. Its totient is φ = 9552033722000.

The previous prime is 21021001202081. The next prime is 21021001202119. The reversal of 21021001202102 is 20120210012012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12704474 + ... + 14263437.

It is an arithmetic number, because the mean of its divisors is an integer number (1444556432214).

Almost surely, 2^{21021001202102} is an apocalyptic number.

21021001202102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021001202102 is a deficient number, since it is larger than the sum of its proper divisors (13648353171034).

21021001202102 is a wasteful number, since it uses less digits than its factorization.

21021001202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26971156 (or 26971145 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021001202102 its reverse (20120210012012), we get a palindrome (41141211214114).

The spelling of 21021001202102 in words is "twenty-one trillion, twenty-one billion, one million, two hundred two thousand, one hundred two".