21010102200 has 144 divisors (see below), whose sum is σ = 72466154280. Its totient is φ = 5451252480.

The previous prime is 21010102189. The next prime is 21010102213. The reversal of 21010102200 is 220101012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 91134 + ... + 224333.

Almost surely, 2^21010102200 is an apocalyptic number.

21010102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010102200 is an abundant number, since it is smaller than the sum of its proper divisors (51456052080).

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

21010102200 is a wasteful number, since it uses less digits than its factorization.

21010102200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315526 (or 315514 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21010102200 its reverse (220101012), we get a palindrome (21230203212).

The spelling of 21010102200 in words is "twenty-one billion, ten million, one hundred two thousand, two hundred".