1220121555115 has 8 divisors (see below), whose sum is σ = 1477578397680. Its totient is φ = 967142223072.

The previous prime is 1220121555097. The next prime is 1220121555151. The reversal of 1220121555115 is 5115551210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220121555115 - 2⁷ = 1220121554987 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1119377029 + ... + 1119378118.

It is an arithmetic number, because the mean of its divisors is an integer number (184697299710).

Almost surely, 2^{1220121555115} is an apocalyptic number.

1220121555115 is a deficient number, since it is larger than the sum of its proper divisors (257456842565).

1220121555115 is a wasteful number, since it uses less digits than its factorization.

1220121555115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238755261.

The product of its (nonzero) digits is 5000, while the sum is 31.

Adding to 1220121555115 its reverse (5115551210221), we get a palindrome (6335672765336).

The spelling of 1220121555115 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, five hundred fifty-five thousand, one hundred fifteen".