30172125121 has 4 divisors (see below), whose sum is σ = 31483956672. Its totient is φ = 28860293572.

The previous prime is 30172125107. The next prime is 30172125127. The reversal of 30172125121 is 12152127103.

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: 12152127103 = 19 ⋅639585637.

It is a cyclic number.

It is not a de Polignac number, because 30172125121 - 2²⁵ = 30138570689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30172125127) 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, 655915741 + ... + 655915786.

It is an arithmetic number, because the mean of its divisors is an integer number (7870989168).

Almost surely, 2^30172125121 is an apocalyptic number.

It is an amenable number.

30172125121 is a deficient number, since it is larger than the sum of its proper divisors (1311831551).

30172125121 is a wasteful number, since it uses less digits than its factorization.

30172125121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311831550.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 30172125121 in words is "thirty billion, one hundred seventy-two million, one hundred twenty-five thousand, one hundred twenty-one".