21996012249 has 12 divisors (see below), whose sum is σ = 32867604900. Its totient is φ = 14158352544.

The previous prime is 21996012239. The next prime is 21996012271. The reversal of 21996012249 is 94221069912.

21996012249 is a `hidden beast` number, since 2 + 19 + 9 + 601 + 2 + 24 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11871627849 + 10124384400 = 108957^2 + 100620^2 .

It is not a de Polignac number, because 21996012249 - 2¹⁷ = 21995881177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21996012239) 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, 42137694 + ... + 42138215.

It is an arithmetic number, because the mean of its divisors is an integer number (2738967075).

Almost surely, 2^21996012249 is an apocalyptic number.

21996012249 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21996012249 is a deficient number, since it is larger than the sum of its proper divisors (10871592651).

21996012249 is a wasteful number, since it uses less digits than its factorization.

21996012249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84275944 (or 84275941 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 21996012249 in words is "twenty-one billion, nine hundred ninety-six million, twelve thousand, two hundred forty-nine".