30987124521 has 4 divisors (see below), whose sum is σ = 41316166032. Its totient is φ = 20658083012.

The previous prime is 30987124481. The next prime is 30987124537. The reversal of 30987124521 is 12542178903.

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: 12542178903 = 3 ⋅4180726301.

It is a cyclic number.

It is not a de Polignac number, because 30987124521 - 2²³ = 30978735913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30987124591) 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, 5164520751 + ... + 5164520756.

It is an arithmetic number, because the mean of its divisors is an integer number (10329041508).

Almost surely, 2^30987124521 is an apocalyptic number.

It is an amenable number.

30987124521 is a deficient number, since it is larger than the sum of its proper divisors (10329041511).

30987124521 is a wasteful number, since it uses less digits than its factorization.

30987124521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10329041510.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 30987124521 in words is "thirty billion, nine hundred eighty-seven million, one hundred twenty-four thousand, five hundred twenty-one".