21375113918 has 8 divisors (see below), whose sum is σ = 32065174560. Its totient is φ = 10686722400.

The previous prime is 21375113899. The next prime is 21375113959. The reversal of 21375113918 is 81931157312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21375113918³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384758 + ... + 436793.

It is an arithmetic number, because the mean of its divisors is an integer number (4008146820).

Almost surely, 2^21375113918 is an apocalyptic number.

21375113918 is a deficient number, since it is larger than the sum of its proper divisors (10690060642).

21375113918 is a wasteful number, since it uses less digits than its factorization.

21375113918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834562.

The product of its digits is 45360, while the sum is 41.

The spelling of 21375113918 in words is "twenty-one billion, three hundred seventy-five million, one hundred thirteen thousand, nine hundred eighteen".