21021713721082 has 32 divisors (see below), whose sum is σ = 31850945280000. Its totient is φ = 10405312783488.

The previous prime is 21021713721077. The next prime is 21021713721109. The reversal of 21021713721082 is 28012731712012.

It is a super-2 number, since 2×21021713721082² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175576294 + ... + 175695982.

It is an arithmetic number, because the mean of its divisors is an integer number (995342040000).

Almost surely, 2^{21021713721082} is an apocalyptic number.

21021713721082 is a deficient number, since it is larger than the sum of its proper divisors (10829231558918).

21021713721082 is a wasteful number, since it uses less digits than its factorization.

21021713721082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122110.

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 21021713721082 in words is "twenty-one trillion, twenty-one billion, seven hundred thirteen million, seven hundred twenty-one thousand, eighty-two".