240121155 has 16 divisors (see below), whose sum is σ = 384862464. Its totient is φ = 127841760.

The previous prime is 240121153. The next prime is 240121169. The reversal of 240121155 is 551121042.

It is not a de Polignac number, because 240121155 - 2¹ = 240121153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4831 + ... + 22440.

It is an arithmetic number, because the mean of its divisors is an integer number (24053904).

Almost surely, 2^240121155 is an apocalyptic number.

240121155 is a deficient number, since it is larger than the sum of its proper divisors (144741309).

240121155 is a wasteful number, since it uses less digits than its factorization.

240121155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27866.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 240121155 is about 15495.8431522780. The cubic root of 240121155 is about 621.5510549200.

Adding to 240121155 its reverse (551121042), we get a palindrome (791242197).

The spelling of 240121155 in words is "two hundred forty million, one hundred twenty-one thousand, one hundred fifty-five".