231433401421 has 2 divisors, whose sum is σ = 231433401422. Its totient is φ = 231433401420.

The previous prime is 231433401413. The next prime is 231433401431. The reversal of 231433401421 is 124104334132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171902281321 + 59531120100 = 414611^2 + 243990^2 .

It is a cyclic number.

It is not a de Polignac number, because 231433401421 - 2³ = 231433401413 is a prime.

It is a super-2 number, since 2×231433401421² (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 231433401421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231433401431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115716700710 + 115716700711.

It is an arithmetic number, because the mean of its divisors is an integer number (115716700711).

Almost surely, 2^231433401421 is an apocalyptic number.

It is an amenable number.

231433401421 is a deficient number, since it is larger than the sum of its proper divisors (1).

231433401421 is an equidigital number, since it uses as much as digits as its factorization.

231433401421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 231433401421 its reverse (124104334132), we get a palindrome (355537735553).

The spelling of 231433401421 in words is "two hundred thirty-one billion, four hundred thirty-three million, four hundred one thousand, four hundred twenty-one".