21012032200 has 48 divisors (see below), whose sum is σ = 49164213780. Its totient is φ = 8351266560.

The previous prime is 21012032183. The next prime is 21012032243. The reversal of 21012032200 is 223021012.

It can be written as a sum of positive squares in 6 ways, for example, as 13320391396 + 7691640804 = 115414^2 + 87702^2 .

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, 303187 + ... + 365986.

Almost surely, 2^21012032200 is an apocalyptic number.

21012032200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012032200 is an abundant number, since it is smaller than the sum of its proper divisors (28152181580).

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

21012032200 is a wasteful number, since it uses less digits than its factorization.

21012032200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669346 (or 669337 counting only the distinct ones).

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

Adding to 21012032200 its reverse (223021012), we get a palindrome (21235053212).

The spelling of 21012032200 in words is "twenty-one billion, twelve million, thirty-two thousand, two hundred".