21903987879439 has 8 divisors (see below), whose sum is σ = 22098629364912. Its totient is φ = 21709360444800.

The previous prime is 21903987879413. The next prime is 21903987879463. The reversal of 21903987879439 is 93497878930912.

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

It is a cyclic number.

It is not a de Polignac number, because 21903987879439 - 2⁵ = 21903987879407 is a prime.

It is a super-2 number, since 2×21903987879439² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903987879469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368589 + ... + 6629014.

It is an arithmetic number, because the mean of its divisors is an integer number (2762328670614).

Almost surely, 2^{21903987879439} is an apocalyptic number.

21903987879439 is a deficient number, since it is larger than the sum of its proper divisors (194641485473).

21903987879439 is a wasteful number, since it uses less digits than its factorization.

21903987879439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025417.

The product of its (nonzero) digits is 1481421312, while the sum is 79.

The spelling of 21903987879439 in words is "twenty-one trillion, nine hundred three billion, nine hundred eighty-seven million, eight hundred seventy-nine thousand, four hundred thirty-nine".