1240121121 has 4 divisors (see below), whose sum is σ = 1653494832. Its totient is φ = 826747412.

The previous prime is 1240121111. The next prime is 1240121143. The reversal of 1240121121 is 1211210421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240121121 - 2²⁹ = 703250209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240121121.

It is not an unprimeable number, because it can be changed into a prime (1240121101) 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 3 ways as a sum of consecutive naturals, for example, 206686851 + ... + 206686856.

It is an arithmetic number, because the mean of its divisors is an integer number (413373708).

Almost surely, 2^1240121121 is an apocalyptic number.

It is an amenable number.

1240121121 is a deficient number, since it is larger than the sum of its proper divisors (413373711).

1240121121 is an equidigital number, since it uses as much as digits as its factorization.

1240121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413373710.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1240121121 is about 35215.3534839564. The cubic root of 1240121121 is about 1074.3720496298.

Adding to 1240121121 its reverse (1211210421), we get a palindrome (2451331542).

The spelling of 1240121121 in words is "one billion, two hundred forty million, one hundred twenty-one thousand, one hundred twenty-one".