21404615075 has 12 divisors (see below), whose sum is σ = 27456955440. Its totient is φ = 16533219360.

The previous prime is 21404615059. The next prime is 21404615081. The reversal of 21404615075 is 57051640412.

It is not a de Polignac number, because 21404615075 - 2⁴ = 21404615059 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14761079 + ... + 14762528.

It is an arithmetic number, because the mean of its divisors is an integer number (2288079620).

Almost surely, 2^21404615075 is an apocalyptic number.

21404615075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21404615075 is a deficient number, since it is larger than the sum of its proper divisors (6052340365).

21404615075 is a wasteful number, since it uses less digits than its factorization.

21404615075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29523646 (or 29523641 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 21404615075 in words is "twenty-one billion, four hundred four million, six hundred fifteen thousand, seventy-five".