30470786921 has 2 divisors, whose sum is σ = 30470786922. Its totient is φ = 30470786920.

The previous prime is 30470786903. The next prime is 30470786953. The reversal of 30470786921 is 12968707403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28608001321 + 1862785600 = 169139^2 + 43160^2 .

It is a cyclic number.

It is not a de Polignac number, because 30470786921 - 2²² = 30466592617 is a prime.

It is not a weakly prime, because it can be changed into another prime (30470786981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15235393460 + 15235393461.

It is an arithmetic number, because the mean of its divisors is an integer number (15235393461).

Almost surely, 2^30470786921 is an apocalyptic number.

It is an amenable number.

30470786921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30470786921 is an equidigital number, since it uses as much as digits as its factorization.

30470786921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 30470786921 in words is "thirty billion, four hundred seventy million, seven hundred eighty-six thousand, nine hundred twenty-one".