121121222015 has 16 divisors (see below), whose sum is σ = 148811478816. Its totient is φ = 94588905600.

The previous prime is 121121222009. The next prime is 121121222041. The reversal of 121121222015 is 510222121121.

It is not a de Polignac number, because 121121222015 - 2⁶ = 121121221951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212525 + ... + 536105.

It is an arithmetic number, because the mean of its divisors is an integer number (9300717426).

Almost surely, 2^121121222015 is an apocalyptic number.

121121222015 is a deficient number, since it is larger than the sum of its proper divisors (27690256801).

121121222015 is a wasteful number, since it uses less digits than its factorization.

121121222015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325370.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 121121222015 its reverse (510222121121), we get a palindrome (631343343136).

The spelling of 121121222015 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, fifteen".