21204891075 has 12 divisors (see below), whose sum is σ = 35058753368. Its totient is φ = 11309275200.

The previous prime is 21204891053. The next prime is 21204891079. The reversal of 21204891075 is 57019840212.

It is not a de Polignac number, because 21204891075 - 2⁷ = 21204890947 is a prime.

It is a super-2 number, since 2×21204891075² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204891079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141365866 + ... + 141366015.

Almost surely, 2^21204891075 is an apocalyptic number.

21204891075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21204891075 is a deficient number, since it is larger than the sum of its proper divisors (13853862293).

21204891075 is a wasteful number, since it uses less digits than its factorization.

21204891075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282731894 (or 282731889 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 21204891075 in words is "twenty-one billion, two hundred four million, eight hundred ninety-one thousand, seventy-five".