121573555 has 16 divisors (see below), whose sum is σ = 148132800. Its totient is φ = 95772160.

The previous prime is 121573541. The next prime is 121573559. The reversal of 121573555 is 555375121.

It is not a de Polignac number, because 121573555 - 2⁵ = 121573523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121573555.

It is not an unprimeable number, because it can be changed into a prime (121573559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159375 + ... + 160135.

It is an arithmetic number, because the mean of its divisors is an integer number (9258300).

Almost surely, 2^121573555 is an apocalyptic number.

121573555 is a deficient number, since it is larger than the sum of its proper divisors (26559245).

121573555 is an equidigital number, since it uses as much as digits as its factorization.

121573555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its digits is 26250, while the sum is 34.

The square root of 121573555 is about 11026.0398602581. The cubic root of 121573555 is about 495.3890150149.

The spelling of 121573555 in words is "one hundred twenty-one million, five hundred seventy-three thousand, five hundred fifty-five".