21745085080 has 32 divisors (see below), whose sum is σ = 50613562800. Its totient is φ = 8398101376.

The previous prime is 21745085069. The next prime is 21745085099. The reversal of 21745085080 is 8058054712.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9371722 + ... + 9374041.

Almost surely, 2^21745085080 is an apocalyptic number.

21745085080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21745085080 is an abundant number, since it is smaller than the sum of its proper divisors (28868477720).

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

21745085080 is a wasteful number, since it uses less digits than its factorization.

21745085080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18745803 (or 18745799 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The spelling of 21745085080 in words is "twenty-one billion, seven hundred forty-five million, eighty-five thousand, eighty".