30121257 has 16 divisors (see below), whose sum is σ = 40983872. Its totient is φ = 19673280.

The previous prime is 30121241. The next prime is 30121261. The reversal of 30121257 is 75212103.

It is not a de Polignac number, because 30121257 - 2⁴ = 30121241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55407 + ... + 55947.

It is an arithmetic number, because the mean of its divisors is an integer number (2561492).

Almost surely, 2^30121257 is an apocalyptic number.

It is an amenable number.

30121257 is a deficient number, since it is larger than the sum of its proper divisors (10862615).

30121257 is a wasteful number, since it uses less digits than its factorization.

30121257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 30121257 is about 5488.2836114764. The cubic root of 30121257 is about 311.1413252638.

The spelling of 30121257 in words is "thirty million, one hundred twenty-one thousand, two hundred fifty-seven".