21010120200 has 576 divisors, whose sum is σ = 78496017600. Its totient is φ = 5206809600.

The previous prime is 21010120189. The next prime is 21010120211. The reversal of 21010120200 is 202101012.

It is an interprime number because it is at equal distance from previous prime (21010120189) and next prime (21010120211).

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 56327214 + ... + 56327586.

Almost surely, 2^21010120200 is an apocalyptic number.

21010120200 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 21010120200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39248008800).

21010120200 is an abundant number, since it is smaller than the sum of its proper divisors (57485897400).

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

21010120200 is a wasteful number, since it uses less digits than its factorization.

21010120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 463 counting only the distinct ones).

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

Adding to 21010120200 its reverse (202101012), we get a palindrome (21212221212).

The spelling of 21010120200 in words is "twenty-one billion, ten million, one hundred twenty thousand, two hundred".