21149285575 has 24 divisors (see below), whose sum is σ = 28616382720. Its totient is φ = 15377445600.

The previous prime is 21149285569. The next prime is 21149285609. The reversal of 21149285575 is 57558294112.

It is not a de Polignac number, because 21149285575 - 2⁵ = 21149285543 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1546116 + ... + 1559734.

It is an arithmetic number, because the mean of its divisors is an integer number (1192349280).

Almost surely, 2^21149285575 is an apocalyptic number.

21149285575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21149285575 is a deficient number, since it is larger than the sum of its proper divisors (7467097145).

21149285575 is a wasteful number, since it uses less digits than its factorization.

21149285575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19287 (or 19282 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 49.

The spelling of 21149285575 in words is "twenty-one billion, one hundred forty-nine million, two hundred eighty-five thousand, five hundred seventy-five".