121143555 has 48 divisors (see below), whose sum is σ = 227747520. Its totient is φ = 59215104.

The previous prime is 121143521. The next prime is 121143569. The reversal of 121143555 is 555341121.

It is not a de Polignac number, because 121143555 - 2¹⁷ = 121012483 is a prime.

It is a super-3 number, since 3×121143555³ (a number of 25 digits) contains 333 as substring.

Its product of digits (3000) is a multiple of the sum of its prime factors (1500).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91186 + ... + 92504.

It is an arithmetic number, because the mean of its divisors is an integer number (4744740).

Almost surely, 2^121143555 is an apocalyptic number.

121143555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121143555 is a deficient number, since it is larger than the sum of its proper divisors (106603965).

121143555 is a wasteful number, since it uses less digits than its factorization.

121143555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500 (or 1497 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 121143555 is about 11006.5232930295. The cubic root of 121143555 is about 494.8042691103.

Adding to 121143555 its reverse (555341121), we get a palindrome (676484676).

The spelling of 121143555 in words is "one hundred twenty-one million, one hundred forty-three thousand, five hundred fifty-five".