21046626251 has 8 divisors (see below), whose sum is σ = 24056974080. Its totient is φ = 18037200168.

The previous prime is 21046626197. The next prime is 21046626253. The reversal of 21046626251 is 15262664012.

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 21046626251 - 2³⁴ = 3866757067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046626253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180791 + ... + 273456.

It is an arithmetic number, because the mean of its divisors is an integer number (3007121760).

Almost surely, 2^21046626251 is an apocalyptic number.

21046626251 is a deficient number, since it is larger than the sum of its proper divisors (3010347829).

21046626251 is an equidigital number, since it uses as much as digits as its factorization.

21046626251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460873.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21046626251 in words is "twenty-one billion, forty-six million, six hundred twenty-six thousand, two hundred fifty-one".