21976842085 has 16 divisors (see below), whose sum is σ = 29547245952. Its totient is φ = 15551179200.

The previous prime is 21976842049. The next prime is 21976842103. The reversal of 21976842085 is 58024867912.

It is not a de Polignac number, because 21976842085 - 2¹⁵ = 21976809317 is a prime.

It is a Duffinian number.

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, 5397681 + ... + 5401750.

It is an arithmetic number, because the mean of its divisors is an integer number (1846702872).

Almost surely, 2^21976842085 is an apocalyptic number.

It is an amenable number.

21976842085 is a deficient number, since it is larger than the sum of its proper divisors (7570403867).

21976842085 is a wasteful number, since it uses less digits than its factorization.

21976842085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10799484.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 21976842085 in words is "twenty-one billion, nine hundred seventy-six million, eight hundred forty-two thousand, eighty-five".