1212210221200 has 120 divisors (see below), whose sum is σ = 3363980807520. Its totient is φ = 414874060800.

The previous prime is 1212210221179. The next prime is 1212210221231. The reversal of 1212210221200 is 21220122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8028210 + ... + 8177809.

It is an arithmetic number, because the mean of its divisors is an integer number (28033173396).

Almost surely, 2^{1212210221200} is an apocalyptic number.

1212210221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212210221200 is an abundant number, since it is smaller than the sum of its proper divisors (2151770586320).

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

1212210221200 is a wasteful number, since it uses less digits than its factorization.

1212210221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206065 (or 16206054 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212210221200 its reverse (21220122121), we get a palindrome (1233430343321).

The spelling of 1212210221200 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, two hundred".