121241621 has 2 divisors, whose sum is σ = 121241622. Its totient is φ = 121241620.

The previous prime is 121241597. The next prime is 121241647. The reversal of 121241621 is 126142121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 11222500 = 10489^2 + 3350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121241621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121241593 and 121241602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121241821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60620810 + 60620811.

It is an arithmetic number, because the mean of its divisors is an integer number (60620811).

Almost surely, 2^121241621 is an apocalyptic number.

It is an amenable number.

121241621 is a deficient number, since it is larger than the sum of its proper divisors (1).

121241621 is an equidigital number, since it uses as much as digits as its factorization.

121241621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 121241621 is about 11010.9772954084. The cubic root of 121241621 is about 494.9377481828.

Adding to 121241621 its reverse (126142121), we get a palindrome (247383742).

The spelling of 121241621 in words is "one hundred twenty-one million, two hundred forty-one thousand, six hundred twenty-one".