21676464386 has 8 divisors (see below), whose sum is σ = 32702643324. Its totient is φ = 10775583280.

The previous prime is 21676464371. The next prime is 21676464401. The reversal of 21676464386 is 68346467612.

It is an interprime number because it is at equal distance from previous prime (21676464371) and next prime (21676464401).

It can be written as a sum of positive squares in 2 ways, for example, as 20656875625 + 1019588761 = 143725^2 + 31931^2 .

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

It is a super-3 number, since 3×21676464386³ (a number of 32 digits) contains 333 as substring.

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, 31324025 + ... + 31324716.

Almost surely, 2^21676464386 is an apocalyptic number.

21676464386 is a deficient number, since it is larger than the sum of its proper divisors (11026178938).

21676464386 is a wasteful number, since it uses less digits than its factorization.

21676464386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62648916.

The product of its digits is 6967296, while the sum is 53.

The spelling of 21676464386 in words is "twenty-one billion, six hundred seventy-six million, four hundred sixty-four thousand, three hundred eighty-six".