21010011200 has 42 divisors (see below), whose sum is σ = 51697762746. Its totient is φ = 8404003840.

The previous prime is 21010011199. The next prime is 21010011203. The reversal of 21010011200 is 211001012.

It can be written as a sum of positive squares in 3 ways, for example, as 1302343744 + 19707667456 = 36088^2 + 140384^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is not an unprimeable number, because it can be changed into a prime (21010011203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6564029 + ... + 6567228.

It is an arithmetic number, because the mean of its divisors is an integer number (1230899113).

Almost surely, 2^21010011200 is an apocalyptic number.

21010011200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010011200 is an abundant number, since it is smaller than the sum of its proper divisors (30687751546).

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

21010011200 is a wasteful number, since it uses less digits than its factorization.

21010011200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13131279 (or 13131264 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010011200 its reverse (211001012), we get a palindrome (21221012212).

The spelling of 21010011200 in words is "twenty-one billion, ten million, eleven thousand, two hundred".