1217220157155 has 32 divisors (see below), whose sum is σ = 2062188120384. Its totient is φ = 610974867456.

The previous prime is 1217220157151. The next prime is 1217220157169. The reversal of 1217220157155 is 5517510227121.

It is not a de Polignac number, because 1217220157155 - 2² = 1217220157151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217220157151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8870427 + ... + 9006603.

It is an arithmetic number, because the mean of its divisors is an integer number (64443378762).

Almost surely, 2^{1217220157155} is an apocalyptic number.

1217220157155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1217220157155 is a deficient number, since it is larger than the sum of its proper divisors (844967963229).

1217220157155 is a wasteful number, since it uses less digits than its factorization.

1217220157155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171255.

The product of its (nonzero) digits is 49000, while the sum is 39.

The spelling of 1217220157155 in words is "one trillion, two hundred seventeen billion, two hundred twenty million, one hundred fifty-seven thousand, one hundred fifty-five".