121020521 has 2 divisors, whose sum is σ = 121020522. Its totient is φ = 121020520.

The previous prime is 121020463. The next prime is 121020541. The reversal of 121020521 is 125020121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90935296 + 30085225 = 9536^2 + 5485^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020521 - 2¹⁴ = 121004137 is a prime.

It is a super-2 number, since 2×121020521² = 29291933006222882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121020496 and 121020505.

It is not a weakly prime, because it can be changed into another prime (121020541) 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, 60510260 + 60510261.

It is an arithmetic number, because the mean of its divisors is an integer number (60510261).

Almost surely, 2^121020521 is an apocalyptic number.

It is an amenable number.

121020521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020521 is an equidigital number, since it uses as much as digits as its factorization.

121020521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 121020521 is about 11000.9327331822. The cubic root of 121020521 is about 494.6367038078.

Adding to 121020521 its reverse (125020121), we get a palindrome (246040642).

The spelling of 121020521 in words is "one hundred twenty-one million, twenty thousand, five hundred twenty-one".