21001012112200 has 48 divisors (see below), whose sum is σ = 48940641884160. Its totient is φ = 8380914312000.

The previous prime is 21001012112177. The next prime is 21001012112263. The reversal of 21001012112200 is 221121010012.

It is a super-2 number, since 2×21001012112200² (a number of 27 digits) contains 22 as substring.

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, 121729416 + ... + 121901815.

It is an arithmetic number, because the mean of its divisors is an integer number (1019596705920).

Almost surely, 2^{21001012112200} is an apocalyptic number.

21001012112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001012112200 is an abundant number, since it is smaller than the sum of its proper divisors (27939629771960).

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

21001012112200 is a wasteful number, since it uses less digits than its factorization.

21001012112200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243631678 (or 243631669 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001012112200 its reverse (221121010012), we get a palindrome (21222133122212).

The spelling of 21001012112200 in words is "twenty-one trillion, one billion, twelve million, one hundred twelve thousand, two hundred".