21890079099 has 12 divisors (see below), whose sum is σ = 36136003696. Its totient is φ = 12508616592.

The previous prime is 21890078993. The next prime is 21890079103. The reversal of 21890079099 is 99097009812.

It is not a de Polignac number, because 21890079099 - 2²⁷ = 21755861371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21890075099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173730724 + ... + 173730849.

Almost surely, 2^21890079099 is an apocalyptic number.

21890079099 is a deficient number, since it is larger than the sum of its proper divisors (14245924597).

21890079099 is a wasteful number, since it uses less digits than its factorization.

21890079099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347461586 (or 347461583 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 21890079099 in words is "twenty-one billion, eight hundred ninety million, seventy-nine thousand, ninety-nine".