21765342700 has 18 divisors (see below), whose sum is σ = 47230793876. Its totient is φ = 8706137040.

The previous prime is 21765342671. The next prime is 21765342749. The reversal of 21765342700 is 724356712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21765342700.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108826614 + ... + 108826813.

Almost surely, 2^21765342700 is an apocalyptic number.

21765342700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21765342700 is an abundant number, since it is smaller than the sum of its proper divisors (25465451176).

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

21765342700 is a wasteful number, since it uses less digits than its factorization.

21765342700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217653441 (or 217653434 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 21765342700 in words is "twenty-one billion, seven hundred sixty-five million, three hundred forty-two thousand, seven hundred".