30640294621 has 2 divisors, whose sum is σ = 30640294622. Its totient is φ = 30640294620.

The previous prime is 30640294469. The next prime is 30640294639. The reversal of 30640294621 is 12649204603.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30286440900 + 353853721 = 174030^2 + 18811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30640294621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30640298621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320147310 + 15320147311.

It is an arithmetic number, because the mean of its divisors is an integer number (15320147311).

Almost surely, 2^30640294621 is an apocalyptic number.

It is an amenable number.

30640294621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640294621 is an equidigital number, since it uses as much as digits as its factorization.

30640294621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 30640294621 in words is "thirty billion, six hundred forty million, two hundred ninety-four thousand, six hundred twenty-one".