21252862655 has 8 divisors (see below), whose sum is σ = 25507866384. Its totient is φ = 16999336000.

The previous prime is 21252862633. The next prime is 21252862667. The reversal of 21252862655 is 55626825212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21252862655 - 2⁶ = 21252862591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337361 + ... + 395370.

It is an arithmetic number, because the mean of its divisors is an integer number (3188483298).

Almost surely, 2^21252862655 is an apocalyptic number.

21252862655 is a deficient number, since it is larger than the sum of its proper divisors (4255003729).

21252862655 is an equidigital number, since it uses as much as digits as its factorization.

21252862655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738537.

The product of its digits is 576000, while the sum is 44.

The spelling of 21252862655 in words is "twenty-one billion, two hundred fifty-two million, eight hundred sixty-two thousand, six hundred fifty-five".