21354612720572 has 24 divisors (see below), whose sum is σ = 37509858966720. Its totient is φ = 10637513075520.

The previous prime is 21354612720563. The next prime is 21354612720589. The reversal of 21354612720572 is 27502721645312.

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, 30119738 + ... + 30820574.

It is an arithmetic number, because the mean of its divisors is an integer number (1562910790280).

Almost surely, 2^{21354612720572} is an apocalyptic number.

It is an amenable number.

21354612720572 is a deficient number, since it is larger than the sum of its proper divisors (16155246246148).

21354612720572 is a wasteful number, since it uses less digits than its factorization.

21354612720572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729221 (or 729219 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 21354612720572 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred twelve million, seven hundred twenty thousand, five hundred seventy-two".