21678467328 has 108 divisors (see below), whose sum is σ = 71433613888. Its totient is φ = 6193843200.

The previous prime is 21678467263. The next prime is 21678467333. The reversal of 21678467328 is 82376487612.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 655948 + ... + 688203.

Almost surely, 2^21678467328 is an apocalyptic number.

21678467328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21678467328 is an abundant number, since it is smaller than the sum of its proper divisors (49755146560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21678467328 is a wasteful number, since it uses less digits than its factorization.

21678467328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344180 (or 1344163 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 21678467328 in words is "twenty-one billion, six hundred seventy-eight million, four hundred sixty-seven thousand, three hundred twenty-eight".