21556151316131 has 8 divisors (see below), whose sum is σ = 21699402954528. Its totient is φ = 21412906200000.

The previous prime is 21556151316079. The next prime is 21556151316149. The reversal of 21556151316131 is 13161315165512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21556151316131 - 2¹⁴ = 21556151299747 is a prime.

It is a super-2 number, since 2×21556151316131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21556151316151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5093231 + ... + 8309831.

It is an arithmetic number, because the mean of its divisors is an integer number (2712425369316).

Almost surely, 2^{21556151316131} is an apocalyptic number.

21556151316131 is a deficient number, since it is larger than the sum of its proper divisors (143251638397).

21556151316131 is a wasteful number, since it uses less digits than its factorization.

21556151316131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261133.

The product of its digits is 81000, while the sum is 41.

The spelling of 21556151316131 in words is "twenty-one trillion, five hundred fifty-six billion, one hundred fifty-one million, three hundred sixteen thousand, one hundred thirty-one".