31230121220747 has 2 divisors, whose sum is σ = 31230121220748. Its totient is φ = 31230121220746.

The previous prime is 31230121220741. The next prime is 31230121220777. The reversal of 31230121220747 is 74702212103213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31230121220747 - 2⁴ = 31230121220731 is a prime.

It is not a weakly prime, because it can be changed into another prime (31230121220741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615060610373 + 15615060610374.

It is an arithmetic number, because the mean of its divisors is an integer number (15615060610374).

Almost surely, 2^{31230121220747} is an apocalyptic number.

31230121220747 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230121220747 is an equidigital number, since it uses as much as digits as its factorization.

31230121220747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 31230121220747 in words is "thirty-one trillion, two hundred thirty billion, one hundred twenty-one million, two hundred twenty thousand, seven hundred forty-seven".