30854951721 has 18 divisors (see below), whose sum is σ = 48988258410. Its totient is φ = 18699970080.

The previous prime is 30854951693. The next prime is 30854951747. The reversal of 30854951721 is 12715945803.

30854951721 is a `hidden beast` number, since 30 + 8 + 549 + 5 + 1 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28136372121 + 2718579600 = 167739^2 + 52140^2 .

It is not a de Polignac number, because 30854951721 - 2⁶ = 30854951657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30854951321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14165556 + ... + 14167733.

Almost surely, 2^30854951721 is an apocalyptic number.

It is an amenable number.

30854951721 is a deficient number, since it is larger than the sum of its proper divisors (18133306689).

30854951721 is a wasteful number, since it uses less digits than its factorization.

30854951721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28333317 (or 28333303 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 30854951721 in words is "thirty billion, eight hundred fifty-four million, nine hundred fifty-one thousand, seven hundred twenty-one".