21976142616 has 64 divisors (see below), whose sum is σ = 61162322400. Its totient is φ = 7311283200.

The previous prime is 21976142593. The next prime is 21976142633. The reversal of 21976142616 is 61624167912.

21976142616 is a `hidden beast` number, since 2 + 1 + 9 + 7 + 614 + 26 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14896 + ... + 210176.

Almost surely, 2^21976142616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21976142616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30581161200).

21976142616 is an abundant number, since it is smaller than the sum of its proper divisors (39186179784).

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

21976142616 is a wasteful number, since it uses less digits than its factorization.

21976142616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195817 (or 195807 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 21976142616 in words is "twenty-one billion, nine hundred seventy-six million, one hundred forty-two thousand, six hundred sixteen".