21678147632 has 10 divisors (see below), whose sum is σ = 42001411068. Its totient is φ = 10839073808.

The previous prime is 21678147619. The next prime is 21678147649. The reversal of 21678147632 is 23674187612.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677442098 + ... + 677442129.

Almost surely, 2^21678147632 is an apocalyptic number.

It is an amenable number.

21678147632 is a deficient number, since it is larger than the sum of its proper divisors (20323263436).

21678147632 is a wasteful number, since it uses less digits than its factorization.

21678147632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354884235 (or 1354884229 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The spelling of 21678147632 in words is "twenty-one billion, six hundred seventy-eight million, one hundred forty-seven thousand, six hundred thirty-two".