121612155 has 64 divisors (see below), whose sum is σ = 238491648. Its totient is φ = 51701760.

The previous prime is 121612133. The next prime is 121612159. The reversal of 121612155 is 551216121.

It is not a de Polignac number, because 121612155 - 2⁶ = 121612091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121612159) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88675 + ... + 90035.

It is an arithmetic number, because the mean of its divisors is an integer number (3726432).

Almost surely, 2^121612155 is an apocalyptic number.

121612155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121612155 is a deficient number, since it is larger than the sum of its proper divisors (116879493).

121612155 is a wasteful number, since it uses less digits than its factorization.

121612155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its digits is 600, while the sum is 24.

The square root of 121612155 is about 11027.7901231389. The cubic root of 121612155 is about 495.4414386761.

Adding to 121612155 its reverse (551216121), we get a palindrome (672828276).

The spelling of 121612155 in words is "one hundred twenty-one million, six hundred twelve thousand, one hundred fifty-five".