21874059261 has 8 divisors (see below), whose sum is σ = 32406013760. Its totient is φ = 14582706156.

The previous prime is 21874059257. The next prime is 21874059323. The reversal of 21874059261 is 16295047812.

21874059261 is a `hidden beast` number, since 2 + 18 + 7 + 40 + 592 + 6 + 1 = 666.

It is not a de Polignac number, because 21874059261 - 2² = 21874059257 is a prime.

It is a super-2 number, since 2×21874059261² (a number of 21 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 (21874059241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405075145 + ... + 405075198.

It is an arithmetic number, because the mean of its divisors is an integer number (4050751720).

Almost surely, 2^21874059261 is an apocalyptic number.

It is an amenable number.

21874059261 is a deficient number, since it is larger than the sum of its proper divisors (10531954499).

21874059261 is an equidigital number, since it uses as much as digits as its factorization.

21874059261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810150352 (or 810150346 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 21874059261 in words is "twenty-one billion, eight hundred seventy-four million, fifty-nine thousand, two hundred sixty-one".