121255618 has 16 divisors (see below), whose sum is σ = 198617184. Its totient is φ = 55060960.

The previous prime is 121255597. The next prime is 121255621. The reversal of 121255618 is 816552121.

It is a self number, because there is not a number n which added to its sum of digits gives 121255618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26646 + ... + 30862.

It is an arithmetic number, because the mean of its divisors is an integer number (12413574).

Almost surely, 2^121255618 is an apocalyptic number.

121255618 is a deficient number, since it is larger than the sum of its proper divisors (77361566).

121255618 is a wasteful number, since it uses less digits than its factorization.

121255618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5537.

The product of its digits is 4800, while the sum is 31.

The square root of 121255618 is about 11011.6128700568. The cubic root of 121255618 is about 494.9567938345.

The spelling of 121255618 in words is "one hundred twenty-one million, two hundred fifty-five thousand, six hundred eighteen".