231013020421 has 4 divisors (see below), whose sum is σ = 232048953472. Its totient is φ = 229977087372.

The previous prime is 231013020397. The next prime is 231013020463. The reversal of 231013020421 is 124020310132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231013020421 - 2²³ = 231004631813 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 (231013020521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517966191 + ... + 517966636.

It is an arithmetic number, because the mean of its divisors is an integer number (58012238368).

Almost surely, 2^231013020421 is an apocalyptic number.

It is an amenable number.

231013020421 is a deficient number, since it is larger than the sum of its proper divisors (1035933051).

231013020421 is a wasteful number, since it uses less digits than its factorization.

231013020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035933050.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 231013020421 its reverse (124020310132), we get a palindrome (355033330553).

The spelling of 231013020421 in words is "two hundred thirty-one billion, thirteen million, twenty thousand, four hundred twenty-one".