121434721 has 2 divisors, whose sum is σ = 121434722. Its totient is φ = 121434720.

The previous prime is 121434683. The next prime is 121434737. The reversal of 121434721 is 127434121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 1860496 = 10935^2 + 1364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121434721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (121434751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60717360 + 60717361.

It is an arithmetic number, because the mean of its divisors is an integer number (60717361).

Almost surely, 2^121434721 is an apocalyptic number.

It is an amenable number.

121434721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121434721 is an equidigital number, since it uses as much as digits as its factorization.

121434721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 121434721 is about 11019.7423291110. The cubic root of 121434721 is about 495.2003691766.

Adding to 121434721 its reverse (127434121), we get a palindrome (248868842).

The spelling of 121434721 in words is "one hundred twenty-one million, four hundred thirty-four thousand, seven hundred twenty-one".