21718646476 has 12 divisors (see below), whose sum is σ = 39318239520. Its totient is φ = 10484863760.

The previous prime is 21718646431. The next prime is 21718646491. The reversal of 21718646476 is 67464681712.

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, 93614740 + ... + 93614971.

It is an arithmetic number, because the mean of its divisors is an integer number (3276519960).

Almost surely, 2^21718646476 is an apocalyptic number.

It is an amenable number.

21718646476 is a deficient number, since it is larger than the sum of its proper divisors (17599593044).

21718646476 is a wasteful number, since it uses less digits than its factorization.

21718646476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187229744 (or 187229742 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 52.

The spelling of 21718646476 in words is "twenty-one billion, seven hundred eighteen million, six hundred forty-six thousand, four hundred seventy-six".