30919121505 has 24 divisors (see below), whose sum is σ = 53622878400. Its totient is φ = 16481049120.

The previous prime is 30919121479. The next prime is 30919121507. The reversal of 30919121505 is 50512191903.

It is not a de Polignac number, because 30919121505 - 2⁵ = 30919121473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30919121505.

It is not an unprimeable number, because it can be changed into a prime (30919121507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108205 + ... + 271194.

It is an arithmetic number, because the mean of its divisors is an integer number (2234286600).

Almost surely, 2^30919121505 is an apocalyptic number.

It is an amenable number.

30919121505 is a deficient number, since it is larger than the sum of its proper divisors (22703756895).

30919121505 is a wasteful number, since it uses less digits than its factorization.

30919121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381221 (or 381218 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The spelling of 30919121505 in words is "thirty billion, nine hundred nineteen million, one hundred twenty-one thousand, five hundred five".