21706552100 has 36 divisors (see below), whose sum is σ = 48252086148. Its totient is φ = 8470848000.

The previous prime is 21706552099. The next prime is 21706552159. The reversal of 21706552100 is 125560712.

It can be written as a sum of positive squares in 6 ways, for example, as 3981357604 + 17725194496 = 63098^2 + 133136^2 .

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, 2643041 + ... + 2651240.

Almost surely, 2^21706552100 is an apocalyptic number.

21706552100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21706552100 is an abundant number, since it is smaller than the sum of its proper divisors (26545534048).

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

21706552100 is a wasteful number, since it uses less digits than its factorization.

21706552100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5294336 (or 5294329 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 21706552100 in words is "twenty-one billion, seven hundred six million, five hundred fifty-two thousand, one hundred".