21620654143131 has 16 divisors (see below), whose sum is σ = 29824895872800. Its totient is φ = 13915201052928.

The previous prime is 21620654143063. The next prime is 21620654143141. The reversal of 21620654143131 is 13134145602612.

It is not a de Polignac number, because 21620654143131 - 2¹¹ = 21620654141083 is a prime.

It is a super-2 number, since 2×21620654143131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21620654143131.

It is not an unprimeable number, because it can be changed into a prime (21620654143141) 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, 12976426 + ... + 14547471.

It is an arithmetic number, because the mean of its divisors is an integer number (1864055992050).

Almost surely, 2^{21620654143131} is an apocalyptic number.

21620654143131 is a deficient number, since it is larger than the sum of its proper divisors (8204241729669).

21620654143131 is a wasteful number, since it uses less digits than its factorization.

21620654143131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27532958.

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 21620654143131 its reverse (13134145602612), we get a palindrome (34754799745743).

The spelling of 21620654143131 in words is "twenty-one trillion, six hundred twenty billion, six hundred fifty-four million, one hundred forty-three thousand, one hundred thirty-one".