231211001421 has 16 divisors (see below), whose sum is σ = 344514793920. Its totient is φ = 153249678000.

The previous prime is 231211001407. The next prime is 231211001443. The reversal of 231211001421 is 124100112132.

231211001421 is a `hidden beast` number, since 2 + 31 + 211 + 0 + 0 + 1 + 421 = 666.

It is not a de Polignac number, because 231211001421 - 2⁵ = 231211001389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231211001394 and 231211001403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211001821) 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, 24744955 + ... + 24754296.

It is an arithmetic number, because the mean of its divisors is an integer number (21532174620).

Almost surely, 2^231211001421 is an apocalyptic number.

It is an amenable number.

231211001421 is a deficient number, since it is larger than the sum of its proper divisors (113303792499).

231211001421 is a wasteful number, since it uses less digits than its factorization.

231211001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49499433 (or 49499427 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 231211001421 its reverse (124100112132), we get a palindrome (355311113553).

The spelling of 231211001421 in words is "two hundred thirty-one billion, two hundred eleven million, one thousand, four hundred twenty-one".