121619621 has 2 divisors, whose sum is σ = 121619622. Its totient is φ = 121619620.

The previous prime is 121619599. The next prime is 121619647. The reversal of 121619621 is 126916121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86750596 + 34869025 = 9314^2 + 5905^2 .

It is a cyclic number.

It is not a de Polignac number, because 121619621 - 2¹⁰ = 121618597 is a prime.

It is a super-4 number, since 4×121619621⁴ (a number of 33 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121619021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60809810 + 60809811.

It is an arithmetic number, because the mean of its divisors is an integer number (60809811).

Almost surely, 2^121619621 is an apocalyptic number.

It is an amenable number.

121619621 is a deficient number, since it is larger than the sum of its proper divisors (1).

121619621 is an equidigital number, since it uses as much as digits as its factorization.

121619621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 121619621 is about 11028.1286263808. The cubic root of 121619621 is about 495.4515771640.

The spelling of 121619621 in words is "one hundred twenty-one million, six hundred nineteen thousand, six hundred twenty-one".