30956278921 has 2 divisors, whose sum is σ = 30956278922. Its totient is φ = 30956278920.

The previous prime is 30956278901. The next prime is 30956278973. The reversal of 30956278921 is 12987265903.

It is an a-pointer prime, because the next prime (30956278973) can be obtained adding 30956278921 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30411523321 + 544755600 = 174389^2 + 23340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30956278921 is a prime.

It is not a weakly prime, because it can be changed into another prime (30956278901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15478139460 + 15478139461.

It is an arithmetic number, because the mean of its divisors is an integer number (15478139461).

Almost surely, 2^30956278921 is an apocalyptic number.

It is an amenable number.

30956278921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30956278921 is an equidigital number, since it uses as much as digits as its factorization.

30956278921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 30956278921 in words is "thirty billion, nine hundred fifty-six million, two hundred seventy-eight thousand, nine hundred twenty-one".