21359823700 has 36 divisors (see below), whose sum is σ = 46396973980. Its totient is φ = 8535421440.

The previous prime is 21359823671. The next prime is 21359823733. The reversal of 21359823700 is 732895312.

It can be written as a sum of positive squares in 6 ways, for example, as 2536532496 + 18823291204 = 50364^2 + 137198^2 .

It is a congruent number.

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, 4947 + ... + 206746.

Almost surely, 2^21359823700 is an apocalyptic number.

21359823700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21359823700 is an abundant number, since it is smaller than the sum of its proper divisors (25037150280).

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

21359823700 is a wasteful number, since it uses less digits than its factorization.

21359823700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212716 (or 212709 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21359823700 in words is "twenty-one billion, three hundred fifty-nine million, eight hundred twenty-three thousand, seven hundred".