31520421021443 has 2 divisors, whose sum is σ = 31520421021444. Its totient is φ = 31520421021442.

The previous prime is 31520421021409. The next prime is 31520421021511. The reversal of 31520421021443 is 34412012402513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31520421021443 - 2³⁴ = 31503241152259 is a prime.

It is not a weakly prime, because it can be changed into another prime (31520421029443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760210510721 + 15760210510722.

It is an arithmetic number, because the mean of its divisors is an integer number (15760210510722).

Almost surely, 2^{31520421021443} is an apocalyptic number.

31520421021443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520421021443 is an equidigital number, since it uses as much as digits as its factorization.

31520421021443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 31520421021443 its reverse (34412012402513), we get a palindrome (65932433423956).

The spelling of 31520421021443 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty-one million, twenty-one thousand, four hundred forty-three".