21020102200 has 96 divisors (see below), whose sum is σ = 51849873360. Its totient is φ = 7897651200.

The previous prime is 21020102143. The next prime is 21020102273. The reversal of 21020102200 is 220102012.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1772290 + ... + 1784110.

Almost surely, 2^21020102200 is an apocalyptic number.

21020102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020102200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25924936680).

21020102200 is an abundant number, since it is smaller than the sum of its proper divisors (30829771160).

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

21020102200 is a wasteful number, since it uses less digits than its factorization.

21020102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12377 (or 12368 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21020102200 its reverse (220102012), we get a palindrome (21240204212).

The spelling of 21020102200 in words is "twenty-one billion, twenty million, one hundred two thousand, two hundred".