30630694921 has 4 divisors (see below), whose sum is σ = 30633343252. Its totient is φ = 30628046592.

The previous prime is 30630694883. The next prime is 30630694931. The reversal of 30630694921 is 12949603603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9842822521 + 20787872400 = 99211^2 + 144180^2 .

It is a cyclic number.

It is not a de Polignac number, because 30630694921 - 2⁷ = 30630694793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30630694931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306740 + ... + 1329973.

It is an arithmetic number, because the mean of its divisors is an integer number (7658335813).

Almost surely, 2^30630694921 is an apocalyptic number.

It is an amenable number.

30630694921 is a deficient number, since it is larger than the sum of its proper divisors (2648331).

30630694921 is a wasteful number, since it uses less digits than its factorization.

30630694921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648330.

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 30630694921 in words is "thirty billion, six hundred thirty million, six hundred ninety-four thousand, nine hundred twenty-one".