21123380415 has 16 divisors (see below), whose sum is σ = 34583395968. Its totient is φ = 11003807136.

The previous prime is 21123380393. The next prime is 21123380419. The reversal of 21123380415 is 51408332112.

It is not a de Polignac number, because 21123380415 - 2¹² = 21123376319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123380419) 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, 16374069 + ... + 16375358.

It is an arithmetic number, because the mean of its divisors is an integer number (2161462248).

Almost surely, 2^21123380415 is an apocalyptic number.

21123380415 is a deficient number, since it is larger than the sum of its proper divisors (13460015553).

21123380415 is a wasteful number, since it uses less digits than its factorization.

21123380415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32749478.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 21123380415 in words is "twenty-one billion, one hundred twenty-three million, three hundred eighty thousand, four hundred fifteen".