121443521 has 2 divisors, whose sum is σ = 121443522. Its totient is φ = 121443520.

The previous prime is 121443479. The next prime is 121443527. The reversal of 121443521 is 125344121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 11424400 = 10489^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 121443521 - 2¹⁸ = 121181377 is a prime.

It is a super-3 number, since 3×121443521³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (121443527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60721760 + 60721761.

It is an arithmetic number, because the mean of its divisors is an integer number (60721761).

Almost surely, 2^121443521 is an apocalyptic number.

It is an amenable number.

121443521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121443521 is an equidigital number, since it uses as much as digits as its factorization.

121443521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 121443521 is about 11020.1416052608. The cubic root of 121443521 is about 495.2123307692.

Adding to 121443521 its reverse (125344121), we get a palindrome (246787642).

The spelling of 121443521 in words is "one hundred twenty-one million, four hundred forty-three thousand, five hundred twenty-one".