121521427 has 2 divisors, whose sum is σ = 121521428. Its totient is φ = 121521426.

The previous prime is 121521377. The next prime is 121521437. The reversal of 121521427 is 724125121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121521427 - 2⁷ = 121521299 is a prime.

It is not a weakly prime, because it can be changed into another prime (121521437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760713 + 60760714.

It is an arithmetic number, because the mean of its divisors is an integer number (60760714).

Almost surely, 2^121521427 is an apocalyptic number.

121521427 is a deficient number, since it is larger than the sum of its proper divisors (1).

121521427 is an equidigital number, since it uses as much as digits as its factorization.

121521427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 25.

The square root of 121521427 is about 11023.6757481341. The cubic root of 121521427 is about 495.3182010118.

Adding to 121521427 its reverse (724125121), we get a palindrome (845646548).

The spelling of 121521427 in words is "one hundred twenty-one million, five hundred twenty-one thousand, four hundred twenty-seven".