21976613748 has 36 divisors (see below), whose sum is σ = 55924841700. Its totient is φ = 7276371456.

The previous prime is 21976613707. The next prime is 21976613803. The reversal of 21976613748 is 84731667912.

21976613748 is a `hidden beast` number, since 2 + 19 + 7 + 6 + 613 + 7 + 4 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10444431204 + 11532182544 = 102198^2 + 107388^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21976613694 and 21976613703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2043165 + ... + 2053892.

It is an arithmetic number, because the mean of its divisors is an integer number (1553467825).

Almost surely, 2^21976613748 is an apocalyptic number.

It is an amenable number.

21976613748 is an abundant number, since it is smaller than the sum of its proper divisors (33948227952).

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

21976613748 is a wasteful number, since it uses less digits than its factorization.

21976613748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097216 (or 4097211 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 21976613748 in words is "twenty-one billion, nine hundred seventy-six million, six hundred thirteen thousand, seven hundred forty-eight".