21317617582 has 8 divisors (see below), whose sum is σ = 32085561816. Its totient is φ = 10622430312.

The previous prime is 21317617567. The next prime is 21317617603. The reversal of 21317617582 is 28571671312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18188508 + ... + 18189679.

It is an arithmetic number, because the mean of its divisors is an integer number (4010695227).

Almost surely, 2^21317617582 is an apocalyptic number.

21317617582 is a deficient number, since it is larger than the sum of its proper divisors (10767944234).

21317617582 is a wasteful number, since it uses less digits than its factorization.

21317617582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36378482.

The product of its digits is 141120, while the sum is 43.

The spelling of 21317617582 in words is "twenty-one billion, three hundred seventeen million, six hundred seventeen thousand, five hundred eighty-two".