231621402434 has 16 divisors (see below), whose sum is σ = 362553347520. Its totient is φ = 110770717200.

The previous prime is 231621402421. The next prime is 231621402461. The reversal of 231621402434 is 434204126132.

It is a super-2 number, since 2×231621402434² (a number of 24 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 231621402434.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133957 + ... + 1322535.

It is an arithmetic number, because the mean of its divisors is an integer number (22659584220).

Almost surely, 2^231621402434 is an apocalyptic number.

231621402434 is a deficient number, since it is larger than the sum of its proper divisors (130931945086).

231621402434 is a wasteful number, since it uses less digits than its factorization.

231621402434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215305.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 231621402434 its reverse (434204126132), we get a palindrome (665825528566).

The spelling of 231621402434 in words is "two hundred thirty-one billion, six hundred twenty-one million, four hundred two thousand, four hundred thirty-four".