21154556263231 has 8 divisors (see below), whose sum is σ = 22399505133264. Its totient is φ = 19909669971840.

The previous prime is 21154556263201. The next prime is 21154556263249. The reversal of 21154556263231 is 13236265545112.

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 21154556263231 - 2⁷ = 21154556263103 is a prime.

It is a super-2 number, since 2×21154556263231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154556263201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14947785 + ... + 16301698.

It is an arithmetic number, because the mean of its divisors is an integer number (2799938141658).

Almost surely, 2^{21154556263231} is an apocalyptic number.

21154556263231 is a deficient number, since it is larger than the sum of its proper divisors (1244948870033).

21154556263231 is a wasteful number, since it uses less digits than its factorization.

21154556263231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31289321.

The product of its digits is 1296000, while the sum is 46.

The spelling of 21154556263231 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred fifty-six million, two hundred sixty-three thousand, two hundred thirty-one".