21110121200 has 90 divisors (see below), whose sum is σ = 58997458296. Its totient is φ = 7237749120.

The previous prime is 21110121191. The next prime is 21110121259. The reversal of 21110121200 is 212101112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 518924 + ... + 558123.

Almost surely, 2^21110121200 is an apocalyptic number.

21110121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110121200 is an abundant number, since it is smaller than the sum of its proper divisors (37887337096).

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

21110121200 is a wasteful number, since it uses less digits than its factorization.

21110121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077079 (or 1077061 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21110121200 its reverse (212101112), we get a palindrome (21322222312).

The spelling of 21110121200 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred".