31443255234421 has 2 divisors, whose sum is σ = 31443255234422. Its totient is φ = 31443255234420.

The previous prime is 31443255234401. The next prime is 31443255234551. The reversal of 31443255234421 is 12443255234413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31248536021521 + 194719212900 = 5590039^2 + 441270^2 .

It is an emirp because it is prime and its reverse (12443255234413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31443255234421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31443255234401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721627617210 + 15721627617211.

It is an arithmetic number, because the mean of its divisors is an integer number (15721627617211).

Almost surely, 2^{31443255234421} is an apocalyptic number.

It is an amenable number.

31443255234421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31443255234421 is an equidigital number, since it uses as much as digits as its factorization.

31443255234421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 43.

The spelling of 31443255234421 in words is "thirty-one trillion, four hundred forty-three billion, two hundred fifty-five million, two hundred thirty-four thousand, four hundred twenty-one".