21948597800 has 48 divisors (see below), whose sum is σ = 52790175900. Its totient is φ = 8476697600.

The previous prime is 21948597793. The next prime is 21948597823. The reversal of 21948597800 is 879584912.

It can be written as a sum of positive squares in 6 ways, for example, as 7551957604 + 14396640196 = 86902^2 + 119986^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1886321 + ... + 1897920.

Almost surely, 2^21948597800 is an apocalyptic number.

21948597800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21948597800 is an abundant number, since it is smaller than the sum of its proper divisors (30841578100).

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

21948597800 is a wasteful number, since it uses less digits than its factorization.

21948597800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784286 (or 3784277 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 21948597800 in words is "twenty-one billion, nine hundred forty-eight million, five hundred ninety-seven thousand, eight hundred".