21120020001200 has 60 divisors (see below), whose sum is σ = 50743337778048. Its totient is φ = 8447593478400.

The previous prime is 21120020001131. The next prime is 21120020001221. The reversal of 21120020001200 is 210002002112.

It is a happy 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, 6932090 + ... + 9502310.

Almost surely, 2^{21120020001200} is an apocalyptic number.

21120020001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120020001200 is an abundant number, since it is smaller than the sum of its proper divisors (29623317776848).

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

21120020001200 is a wasteful number, since it uses less digits than its factorization.

21120020001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590782 (or 2590771 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21120020001200 its reverse (210002002112), we get a palindrome (21330022003312).

The spelling of 21120020001200 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one thousand, two hundred".