21115351542200 has 48 divisors (see below), whose sum is σ = 50290587290160. Its totient is φ = 8240137184000.

The previous prime is 21115351542179. The next prime is 21115351542221. The reversal of 21115351542200 is 224515351112.

It is an interprime number because it is at equal distance from previous prime (21115351542179) and next prime (21115351542221).

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, 1287513236 + ... + 1287529635.

It is an arithmetic number, because the mean of its divisors is an integer number (1047720568545).

Almost surely, 2^{21115351542200} is an apocalyptic number.

21115351542200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115351542200 is an abundant number, since it is smaller than the sum of its proper divisors (29175235747960).

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

21115351542200 is a wasteful number, since it uses less digits than its factorization.

21115351542200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575042928 (or 2575042919 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 21115351542200 its reverse (224515351112), we get a palindrome (21339866893312).

The spelling of 21115351542200 in words is "twenty-one trillion, one hundred fifteen billion, three hundred fifty-one million, five hundred forty-two thousand, two hundred".