21121302200 has 24 divisors (see below), whose sum is σ = 49107028080. Its totient is φ = 8448520800.

The previous prime is 21121302187. The next prime is 21121302221. The reversal of 21121302200 is 220312112.

It is a happy number.

It is a super-2 number, since 2×21121302200² (a number of 21 digits) contains 22 as substring.

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, 52803056 + ... + 52803455.

It is an arithmetic number, because the mean of its divisors is an integer number (2046126170).

Almost surely, 2^21121302200 is an apocalyptic number.

21121302200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121302200 is an abundant number, since it is smaller than the sum of its proper divisors (27985725880).

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

21121302200 is a wasteful number, since it uses less digits than its factorization.

21121302200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105606527 (or 105606518 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21121302200 its reverse (220312112), we get a palindrome (21341614312).

The spelling of 21121302200 in words is "twenty-one billion, one hundred twenty-one million, three hundred two thousand, two hundred".