21620046211531 has 16 divisors (see below), whose sum is σ = 22789069954560. Its totient is φ = 20470283760960.

The previous prime is 21620046211507. The next prime is 21620046211559. The reversal of 21620046211531 is 13511264002612.

It is a cyclic number.

It is not a de Polignac number, because 21620046211531 - 2¹¹ = 21620046209483 is a prime.

It is a super-2 number, since 2×21620046211531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620046211031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3403200 + ... + 7404178.

It is an arithmetic number, because the mean of its divisors is an integer number (1424316872160).

Almost surely, 2^{21620046211531} is an apocalyptic number.

21620046211531 is a deficient number, since it is larger than the sum of its proper divisors (1169023743029).

21620046211531 is a wasteful number, since it uses less digits than its factorization.

21620046211531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003386.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 21620046211531 in words is "twenty-one trillion, six hundred twenty billion, forty-six million, two hundred eleven thousand, five hundred thirty-one".