121199621 has 2 divisors, whose sum is σ = 121199622. Its totient is φ = 121199620.

The previous prime is 121199597. The next prime is 121199633. The reversal of 121199621 is 126991121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119793025 + 1406596 = 10945^2 + 1186^2 .

It is an emirp because it is prime and its reverse (126991121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121199621 - 2¹⁸ = 120937477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121199641) 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, 60599810 + 60599811.

It is an arithmetic number, because the mean of its divisors is an integer number (60599811).

Almost surely, 2^121199621 is an apocalyptic number.

It is an amenable number.

121199621 is a deficient number, since it is larger than the sum of its proper divisors (1).

121199621 is an equidigital number, since it uses as much as digits as its factorization.

121199621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 32.

The square root of 121199621 is about 11009.0699425519. The cubic root of 121199621 is about 494.8805901813.

The spelling of 121199621 in words is "one hundred twenty-one million, one hundred ninety-nine thousand, six hundred twenty-one".