31212021007 has 2 divisors, whose sum is σ = 31212021008. Its totient is φ = 31212021006.

The previous prime is 31212020989. The next prime is 31212021013. The reversal of 31212021007 is 70012021213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212021007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212051007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606010503 + 15606010504.

It is an arithmetic number, because the mean of its divisors is an integer number (15606010504).

Almost surely, 2^31212021007 is an apocalyptic number.

31212021007 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212021007 is an equidigital number, since it uses as much as digits as its factorization.

31212021007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The spelling of 31212021007 in words is "thirty-one billion, two hundred twelve million, twenty-one thousand, seven".