31520421022043 has 2 divisors, whose sum is σ = 31520421022044. Its totient is φ = 31520421022042.

The previous prime is 31520421022021. The next prime is 31520421022061. The reversal of 31520421022043 is 34022012402513.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31520421022043 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 31520421021997 and 31520421022015.

It is not a weakly prime, because it can be changed into another prime (31520421022073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760210511021 + 15760210511022.

It is an arithmetic number, because the mean of its divisors is an integer number (15760210511022).

Almost surely, 2^{31520421022043} is an apocalyptic number.

31520421022043 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520421022043 is an equidigital number, since it uses as much as digits as its factorization.

31520421022043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 31520421022043 its reverse (34022012402513), we get a palindrome (65542433424556).

The spelling of 31520421022043 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty-one million, twenty-two thousand, forty-three".