21121010200 has 24 divisors (see below), whose sum is σ = 49106349180. Its totient is φ = 8448404000.

The previous prime is 21121010167. The next prime is 21121010221. The reversal of 21121010200 is 201012112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52802326 + ... + 52802725.

Almost surely, 2^21121010200 is an apocalyptic number.

21121010200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121010200 is an abundant number, since it is smaller than the sum of its proper divisors (27985338980).

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

21121010200 is a wasteful number, since it uses less digits than its factorization.

21121010200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105605067 (or 105605058 counting only the distinct ones).

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

Adding to 21121010200 its reverse (201012112), we get a palindrome (21322022312).

The spelling of 21121010200 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, two hundred".