21654261786131 has 16 divisors (see below), whose sum is σ = 24397025482368. Its totient is φ = 19086108326400.

The previous prime is 21654261786089. The next prime is 21654261786167. The reversal of 21654261786131 is 13168716245612.

It is not a de Polignac number, because 21654261786131 - 2¹⁴ = 21654261769747 is a prime.

It is a super-2 number, since 2×21654261786131² (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 (21654261786431) 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, 432178490 + ... + 432228591.

It is an arithmetic number, because the mean of its divisors is an integer number (1524814092648).

Almost surely, 2^{21654261786131} is an apocalyptic number.

21654261786131 is a deficient number, since it is larger than the sum of its proper divisors (2742763696237).

21654261786131 is a wasteful number, since it uses less digits than its factorization.

21654261786131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864407182.

The product of its digits is 2903040, while the sum is 53.

The spelling of 21654261786131 in words is "twenty-one trillion, six hundred fifty-four billion, two hundred sixty-one million, seven hundred eighty-six thousand, one hundred thirty-one".