231551551023321 has 16 divisors (see below), whose sum is σ = 312003071541504. Its totient is φ = 152734731216384.

The previous prime is 231551551023259. The next prime is 231551551023329. The reversal of 231551551023321 is 123320155155132.

It is not a de Polignac number, because 231551551023321 - 2⁶ = 231551551023257 is a prime.

It is a super-2 number, since 2×231551551023321² (a number of 30 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 231551551023321.

It is not an unprimeable number, because it can be changed into a prime (231551551023329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107130945 + ... + 109270958.

It is an arithmetic number, because the mean of its divisors is an integer number (19500191971344).

Almost surely, 2^{231551551023321} is an apocalyptic number.

It is an amenable number.

231551551023321 is a deficient number, since it is larger than the sum of its proper divisors (80451520518183).

231551551023321 is a wasteful number, since it uses less digits than its factorization.

231551551023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216405680.

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 231551551023321 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, five hundred fifty-one million, twenty-three thousand, three hundred twenty-one".