21149256575 has 12 divisors (see below), whose sum is σ = 26413752120. Its totient is φ = 16797680160.

The previous prime is 21149256547. The next prime is 21149256577. The reversal of 21149256575 is 57565294112.

It is not a de Polignac number, because 21149256575 - 2¹⁴ = 21149240191 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149256577) 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 11 ways as a sum of consecutive naturals, for example, 3039584 + ... + 3046533.

It is an arithmetic number, because the mean of its divisors is an integer number (2201146010).

Almost surely, 2^21149256575 is an apocalyptic number.

21149256575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21149256575 is a deficient number, since it is larger than the sum of its proper divisors (5264495545).

21149256575 is a wasteful number, since it uses less digits than its factorization.

21149256575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086266 (or 6086261 counting only the distinct ones).

The product of its digits is 756000, while the sum is 47.

The spelling of 21149256575 in words is "twenty-one billion, one hundred forty-nine million, two hundred fifty-six thousand, five hundred seventy-five".