1211121201200 has 90 divisors (see below), whose sum is σ = 3090947134356. Its totient is φ = 455951467520.

The previous prime is 1211121201187. The next prime is 1211121201211. The reversal of 1211121201200 is 21021211121.

It is a super-2 number, since 2×1211121201200² (a number of 25 digits) contains 22 as substring.

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, 5122814 + ... + 5354013.

Almost surely, 2^{1211121201200} is an apocalyptic number.

1211121201200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211121201200 is an abundant number, since it is smaller than the sum of its proper divisors (1879825933156).

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

1211121201200 is a wasteful number, since it uses less digits than its factorization.

1211121201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10476879 (or 10476851 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211121201200 its reverse (21021211121), we get a palindrome (1232142412321).

The spelling of 1211121201200 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred one thousand, two hundred".