31212020099747 has 2 divisors, whose sum is σ = 31212020099748. Its totient is φ = 31212020099746.

The previous prime is 31212020099723. The next prime is 31212020099789. The reversal of 31212020099747 is 74799002021213.

It is a weak prime.

It is an emirp because it is prime and its reverse (74799002021213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31212020099747 - 2¹⁰ = 31212020098723 is a prime.

It is not a weakly prime, because it can be changed into another prime (31212020099707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606010049873 + 15606010049874.

It is an arithmetic number, because the mean of its divisors is an integer number (15606010049874).

Almost surely, 2^{31212020099747} is an apocalyptic number.

31212020099747 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212020099747 is an equidigital number, since it uses as much as digits as its factorization.

31212020099747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 31212020099747 in words is "thirty-one trillion, two hundred twelve billion, twenty million, ninety-nine thousand, seven hundred forty-seven".