20121121200 has 60 divisors (see below), whose sum is σ = 64454662088. Its totient is φ = 5365632000.

The previous prime is 20121121169. The next prime is 20121121213. The reversal of 20121121200 is 212112102.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 8382601 + ... + 8385000.

Almost surely, 2^20121121200 is an apocalyptic number.

20121121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121121200 is an abundant number, since it is smaller than the sum of its proper divisors (44333540888).

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

20121121200 is a wasteful number, since it uses less digits than its factorization.

20121121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16767622 (or 16767611 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121121200 its reverse (212112102), we get a palindrome (20333233302).

The spelling of 20121121200 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred".