1212111101200 has 60 divisors (see below), whose sum is σ = 2927185692148. Its totient is φ = 482332262400.

The previous prime is 1212111101197. The next prime is 1212111101281. The reversal of 1212111101200 is 21011112121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7806782736 + 1204304318464 = 88356^2 + 1097408^2 .

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, 7773261 + ... + 7927660.

Almost surely, 2^{1212111101200} is an apocalyptic number.

1212111101200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212111101200 is an abundant number, since it is smaller than the sum of its proper divisors (1715074590948).

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

1212111101200 is a wasteful number, since it uses less digits than its factorization.

1212111101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15701132 (or 15701121 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212111101200 its reverse (21011112121), we get a palindrome (1233122213321).

The spelling of 1212111101200 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred one thousand, two hundred".