21101012200 has 48 divisors (see below), whose sum is σ = 49074007500. Its totient is φ = 8437969920.

The previous prime is 21101012183. The next prime is 21101012239. The reversal of 21101012200 is 221010112.

It can be written as a sum of positive squares in 6 ways, for example, as 3171266596 + 17929745604 = 56314^2 + 133902^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 784576 + ... + 811024.

Almost surely, 2^21101012200 is an apocalyptic number.

21101012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101012200 is an abundant number, since it is smaller than the sum of its proper divisors (27972995300).

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

21101012200 is a wasteful number, since it uses less digits than its factorization.

21101012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30454 (or 30445 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101012200 its reverse (221010112), we get a palindrome (21322022312).

The spelling of 21101012200 in words is "twenty-one billion, one hundred one million, twelve thousand, two hundred".