30914921 has 4 divisors (see below), whose sum is σ = 32259072. Its totient is φ = 29570772.

The previous prime is 30914909. The next prime is 30914963. The reversal of 30914921 is 12941903.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12941903 = 13 ⋅995531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30914921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30914971) 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, 672041 + ... + 672086.

It is an arithmetic number, because the mean of its divisors is an integer number (8064768).

Almost surely, 2^30914921 is an apocalyptic number.

It is an amenable number.

30914921 is a deficient number, since it is larger than the sum of its proper divisors (1344151).

30914921 is a wasteful number, since it uses less digits than its factorization.

30914921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344150.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 30914921 is about 5560.1187936950. The cubic root of 30914921 is about 313.8504196478.

The spelling of 30914921 in words is "thirty million, nine hundred fourteen thousand, nine hundred twenty-one".