1212207116155 has 32 divisors (see below), whose sum is σ = 1687438811520. Its totient is φ = 818819635200.

The previous prime is 1212207116069. The next prime is 1212207116161. The reversal of 1212207116155 is 5516117022121.

It is not a de Polignac number, because 1212207116155 - 2⁷ = 1212207116027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212207116155.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173950 + ... + 1566739.

It is an arithmetic number, because the mean of its divisors is an integer number (52732462860).

Almost surely, 2^{1212207116155} is an apocalyptic number.

1212207116155 is a deficient number, since it is larger than the sum of its proper divisors (475231695365).

1212207116155 is a wasteful number, since it uses less digits than its factorization.

1212207116155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740999.

The product of its (nonzero) digits is 8400, while the sum is 34.

The spelling of 1212207116155 in words is "one trillion, two hundred twelve billion, two hundred seven million, one hundred sixteen thousand, one hundred fifty-five".