231515445211421 has 16 divisors (see below), whose sum is σ = 264887696140800. Its totient is φ = 198217859661360.

The previous prime is 231515445211409. The next prime is 231515445211469. The reversal of 231515445211421 is 124112544515132.

It is not a de Polignac number, because 231515445211421 - 2³⁴ = 231498265342237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231515445217421) 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, 254133866 + ... + 255043236.

It is an arithmetic number, because the mean of its divisors is an integer number (16555481008800).

Almost surely, 2^{231515445211421} is an apocalyptic number.

It is an amenable number.

231515445211421 is a deficient number, since it is larger than the sum of its proper divisors (33372250929379).

231515445211421 is an equidigital number, since it uses as much as digits as its factorization.

231515445211421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950384.

The product of its digits is 192000, while the sum is 41.

Adding to 231515445211421 its reverse (124112544515132), we get a palindrome (355627989726553).

The spelling of 231515445211421 in words is "two hundred thirty-one trillion, five hundred fifteen billion, four hundred forty-five million, two hundred eleven thousand, four hundred twenty-one".