121227521 has 2 divisors, whose sum is σ = 121227522. Its totient is φ = 121227520.

The previous prime is 121227517. The next prime is 121227541. The reversal of 121227521 is 125722121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83466496 + 37761025 = 9136^2 + 6145^2 .

It is a cyclic number.

It is not a de Polignac number, because 121227521 - 2² = 121227517 is a prime.

It is a super-2 number, since 2×121227521² = 29392223695610882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121227541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60613760 + 60613761.

It is an arithmetic number, because the mean of its divisors is an integer number (60613761).

Almost surely, 2^121227521 is an apocalyptic number.

It is an amenable number.

121227521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121227521 is an equidigital number, since it uses as much as digits as its factorization.

121227521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560, while the sum is 23.

The square root of 121227521 is about 11010.3370066497. The cubic root of 121227521 is about 494.9185608972.

Adding to 121227521 its reverse (125722121), we get a palindrome (246949642).

The spelling of 121227521 in words is "one hundred twenty-one million, two hundred twenty-seven thousand, five hundred twenty-one".