21223247075 has 12 divisors (see below), whose sum is σ = 26318717280. Its totient is φ = 16977377760.

The previous prime is 21223247051. The next prime is 21223247119. The reversal of 21223247075 is 57074232212.

It is not a de Polignac number, because 21223247075 - 2²⁰ = 21222198499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517421 + ... + 556929.

It is an arithmetic number, because the mean of its divisors is an integer number (2193226440).

Almost surely, 2^21223247075 is an apocalyptic number.

21223247075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21223247075 is a deficient number, since it is larger than the sum of its proper divisors (5095470205).

21223247075 is a wasteful number, since it uses less digits than its factorization.

21223247075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61006 (or 61001 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 35.

Adding to 21223247075 its reverse (57074232212), we get a palindrome (78297479287).

The spelling of 21223247075 in words is "twenty-one billion, two hundred twenty-three million, two hundred forty-seven thousand, seventy-five".