21912849279 has 6 divisors (see below), whose sum is σ = 31651893416. Its totient is φ = 14608566180.

The previous prime is 21912849263. The next prime is 21912849289. The reversal of 21912849279 is 97294821912.

It is a happy number.

21912849279 is a `hidden beast` number, since 2 + 1 + 91 + 284 + 9 + 279 = 666.

It is not a de Polignac number, because 21912849279 - 2⁴ = 21912849263 is a prime.

It is a super-3 number, since 3×21912849279³ (a number of 32 digits) contains 333 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 (21912849229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1217380507 + ... + 1217380524.

Almost surely, 2^21912849279 is an apocalyptic number.

21912849279 is a deficient number, since it is larger than the sum of its proper divisors (9739044137).

21912849279 is a wasteful number, since it uses less digits than its factorization.

21912849279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434761037 (or 2434761034 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The spelling of 21912849279 in words is "twenty-one billion, nine hundred twelve million, eight hundred forty-nine thousand, two hundred seventy-nine".