121626221 has 2 divisors, whose sum is σ = 121626222. Its totient is φ = 121626220.

The previous prime is 121626217. The next prime is 121626223. The reversal of 121626221 is 122626121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115326121 + 6300100 = 10739^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 121626221 - 2² = 121626217 is a prime.

Together with 121626223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121626223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60813110 + 60813111.

It is an arithmetic number, because the mean of its divisors is an integer number (60813111).

Almost surely, 2^121626221 is an apocalyptic number.

It is an amenable number.

121626221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121626221 is an equidigital number, since it uses as much as digits as its factorization.

121626221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 121626221 is about 11028.4278571336. The cubic root of 121626221 is about 495.4605393179.

The spelling of 121626221 in words is "one hundred twenty-one million, six hundred twenty-six thousand, two hundred twenty-one".