121212158017 has 4 divisors (see below), whose sum is σ = 121257271296. Its totient is φ = 121167044740.

The previous prime is 121212158009. The next prime is 121212158051. The reversal of 121212158017 is 710851212121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121212158017 - 2³ = 121212158009 is a prime.

It is a super-2 number, since 2×121212158017² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212158017.

It is not an unprimeable number, because it can be changed into a prime (121212158057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22552609 + ... + 22557982.

It is an arithmetic number, because the mean of its divisors is an integer number (30314317824).

Almost surely, 2^121212158017 is an apocalyptic number.

It is an amenable number.

121212158017 is a deficient number, since it is larger than the sum of its proper divisors (45113279).

121212158017 is an equidigital number, since it uses as much as digits as its factorization.

121212158017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45113278.

The product of its (nonzero) digits is 2240, while the sum is 31.

The spelling of 121212158017 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred fifty-eight thousand, seventeen".