30306979921 has 9 divisors (see below), whose sum is σ = 30611684649. Its totient is φ = 30005283684.

The previous prime is 30306979907. The next prime is 30306979931. The reversal of 30306979921 is 12997960303.

The square root of 30306979921 is 174089.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 30306979921 - 2¹⁹ = 30306455633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30306979931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18626710 + ... + 18628336.

Almost surely, 2^30306979921 is an apocalyptic number.

30306979921 is the 174089-th square number.

30306979921 is the 87045-th centered octagonal number.

It is an amenable number.

30306979921 is a deficient number, since it is larger than the sum of its proper divisors (304704728).

30306979921 is an frugal number, since it uses more digits than its factorization.

30306979921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468 (or 1734 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 49.

Multiplying 30306979921 by its sum of digits (49), we get a square (1485042016129 = 1218623²).

The spelling of 30306979921 in words is "thirty billion, three hundred six million, nine hundred seventy-nine thousand, nine hundred twenty-one".