30472921 has 4 divisors (see below), whose sum is σ = 30492112. Its totient is φ = 30453732.

The previous prime is 30472919. The next prime is 30472943. The reversal of 30472921 is 12927403.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30472921 - 2¹ = 30472919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30472921.

It is not an unprimeable number, because it can be changed into a prime (30472951) 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, 6975 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (7623028).

Almost surely, 2^30472921 is an apocalyptic number.

It is an amenable number.

30472921 is a deficient number, since it is larger than the sum of its proper divisors (19191).

30472921 is a wasteful number, since it uses less digits than its factorization.

30472921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 30472921 is about 5520.2283467262. The cubic root of 30472921 is about 312.3474959348.

The spelling of 30472921 in words is "thirty million, four hundred seventy-two thousand, nine hundred twenty-one".