121244155 has 16 divisors (see below), whose sum is σ = 152182080. Its totient is φ = 92731584.

The previous prime is 121244147. The next prime is 121244183. The reversal of 121244155 is 551442121.

It is not a de Polignac number, because 121244155 - 2³ = 121244147 is a prime.

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, 59839 + ... + 61831.

It is an arithmetic number, because the mean of its divisors is an integer number (9511380).

Almost surely, 2^121244155 is an apocalyptic number.

121244155 is a deficient number, since it is larger than the sum of its proper divisors (30937925).

121244155 is an frugal number, since it uses more digits than its factorization.

121244155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2021 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 121244155 is about 11011.0923617959. The cubic root of 121244155 is about 494.9411962932.

Adding to 121244155 its reverse (551442121), we get a palindrome (672686276).

The spelling of 121244155 in words is "one hundred twenty-one million, two hundred forty-four thousand, one hundred fifty-five".