21575236461 has 32 divisors (see below), whose sum is σ = 29695480320. Its totient is φ = 13927680000.

The previous prime is 21575236453. The next prime is 21575236471. The reversal of 21575236461 is 16463257512.

It is not a de Polignac number, because 21575236461 - 2³ = 21575236453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575236471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5390461 + ... + 5394461.

It is an arithmetic number, because the mean of its divisors is an integer number (927983760).

Almost surely, 2^21575236461 is an apocalyptic number.

It is an amenable number.

21575236461 is a deficient number, since it is larger than the sum of its proper divisors (8120243859).

21575236461 is a wasteful number, since it uses less digits than its factorization.

21575236461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517.

The product of its digits is 302400, while the sum is 42.

The spelling of 21575236461 in words is "twenty-one billion, five hundred seventy-five million, two hundred thirty-six thousand, four hundred sixty-one".