121240151 has 4 divisors (see below), whose sum is σ = 121269312. Its totient is φ = 121210992.

The previous prime is 121240139. The next prime is 121240181. The reversal of 121240151 is 151042121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121240151 - 2⁶ = 121240087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121240181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7046 + ... + 17091.

It is an arithmetic number, because the mean of its divisors is an integer number (30317328).

Almost surely, 2^121240151 is an apocalyptic number.

121240151 is a deficient number, since it is larger than the sum of its proper divisors (29161).

121240151 is an equidigital number, since it uses as much as digits as its factorization.

121240151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29160.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 121240151 is about 11010.9105436381. The cubic root of 121240151 is about 494.9357478756.

Adding to 121240151 its reverse (151042121), we get a palindrome (272282272).

The spelling of 121240151 in words is "one hundred twenty-one million, two hundred forty thousand, one hundred fifty-one".