21166226600 has 48 divisors (see below), whose sum is σ = 49698766620. Its totient is φ = 8382656000.

The previous prime is 21166226597. The next prime is 21166226621. The reversal of 21166226600 is 662266112.

It can be written as a sum of positive squares in 6 ways, for example, as 16821571204 + 4344655396 = 129698^2 + 65914^2 .

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, 503717 + ... + 544116.

Almost surely, 2^21166226600 is an apocalyptic number.

21166226600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21166226600 is an abundant number, since it is smaller than the sum of its proper divisors (28532540020).

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

21166226600 is a wasteful number, since it uses less digits than its factorization.

21166226600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047950 (or 1047941 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21166226600 in words is "twenty-one billion, one hundred sixty-six million, two hundred twenty-six thousand, six hundred".