21620542012610 has 16 divisors (see below), whose sum is σ = 39027222018936. Its totient is φ = 8623717605888.

The previous prime is 21620542012607. The next prime is 21620542012613. The reversal of 21620542012610 is 1621024502612.

It is an interprime number because it is at equal distance from previous prime (21620542012607) and next prime (21620542012613).

It can be written as a sum of positive squares in 4 ways, for example, as 20976225960361 + 644316052249 = 4579981^2 + 802693^2 .

It is not an unprimeable number, because it can be changed into a prime (21620542012613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3062396189 + ... + 3062403248.

Almost surely, 2^{21620542012610} is an apocalyptic number.

21620542012610 is a deficient number, since it is larger than the sum of its proper divisors (17406680006326).

21620542012610 is a wasteful number, since it uses less digits than its factorization.

21620542012610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124799797.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21620542012610 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-two million, twelve thousand, six hundred ten".