121282621 has 2 divisors, whose sum is σ = 121282622. Its totient is φ = 121282620.

The previous prime is 121282619. The next prime is 121282631. The reversal of 121282621 is 126282121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84437721 + 36844900 = 9189^2 + 6070^2 .

It is a cyclic number.

It is not a de Polignac number, because 121282621 - 2¹ = 121282619 is a prime.

Together with 121282619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121282631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60641310 + 60641311.

It is an arithmetic number, because the mean of its divisors is an integer number (60641311).

Almost surely, 2^121282621 is an apocalyptic number.

It is an amenable number.

121282621 is a deficient number, since it is larger than the sum of its proper divisors (1).

121282621 is an equidigital number, since it uses as much as digits as its factorization.

121282621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 121282621 is about 11012.8389164647. The cubic root of 121282621 is about 494.9935325482.

The spelling of 121282621 in words is "one hundred twenty-one million, two hundred eighty-two thousand, six hundred twenty-one".