21173312762 has 24 divisors (see below), whose sum is σ = 38557834464. Its totient is φ = 8540494272.

The previous prime is 21173312753. The next prime is 21173312773. The reversal of 21173312762 is 26721337112.

It is a happy 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 11 ways as a sum of consecutive naturals, for example, 2612528 + ... + 2620619.

It is an arithmetic number, because the mean of its divisors is an integer number (1606576436).

Almost surely, 2^21173312762 is an apocalyptic number.

21173312762 is a deficient number, since it is larger than the sum of its proper divisors (17384521702).

21173312762 is a wasteful number, since it uses less digits than its factorization.

21173312762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233190 (or 5233173 counting only the distinct ones).

The product of its digits is 21168, while the sum is 35.

Adding to 21173312762 its reverse (26721337112), we get a palindrome (47894649874).

The spelling of 21173312762 in words is "twenty-one billion, one hundred seventy-three million, three hundred twelve thousand, seven hundred sixty-two".