21013102200 has 48 divisors (see below), whose sum is σ = 65140618680. Its totient is φ = 5603493760.

The previous prime is 21013102189. The next prime is 21013102211. The reversal of 21013102200 is 220131012.

It is an interprime number because it is at equal distance from previous prime (21013102189) and next prime (21013102211).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 17510319 + ... + 17511518.

Almost surely, 2^21013102200 is an apocalyptic number.

21013102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013102200 is an abundant number, since it is smaller than the sum of its proper divisors (44127516480).

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

21013102200 is a wasteful number, since it uses less digits than its factorization.

21013102200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35021856 (or 35021847 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21013102200 its reverse (220131012), we get a palindrome (21233233212).

The spelling of 21013102200 in words is "twenty-one billion, thirteen million, one hundred two thousand, two hundred".