21980652416 has 16 divisors (see below), whose sum is σ = 43789581240. Its totient is φ = 10990326144.

The previous prime is 21980652389. The next prime is 21980652427. The reversal of 21980652416 is 61425608912.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85861796 + ... + 85862051.

Almost surely, 2^21980652416 is an apocalyptic number.

It is an amenable number.

21980652416 is a deficient number, since it is larger than the sum of its proper divisors (21808928824).

21980652416 is an equidigital number, since it uses as much as digits as its factorization.

21980652416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171723861 (or 171723849 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21980652416 in words is "twenty-one billion, nine hundred eighty million, six hundred fifty-two thousand, four hundred sixteen".