21200322100 has 36 divisors (see below), whose sum is σ = 46018203084. Its totient is φ = 8477639680.

The previous prime is 21200322089. The next prime is 21200322119. The reversal of 21200322100 is 122300212.

It can be written as a sum of positive squares in 6 ways, for example, as 387066276 + 20813255824 = 19674^2 + 144268^2 .

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, 332394 + ... + 391006.

It is an arithmetic number, because the mean of its divisors is an integer number (1278283419).

Almost surely, 2^21200322100 is an apocalyptic number.

21200322100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200322100 is an abundant number, since it is smaller than the sum of its proper divisors (24817880984).

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

21200322100 is a wasteful number, since it uses less digits than its factorization.

21200322100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62244 (or 62237 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21200322100 its reverse (122300212), we get a palindrome (21322622312).

The spelling of 21200322100 in words is "twenty-one billion, two hundred million, three hundred twenty-two thousand, one hundred".