121634021 has 2 divisors, whose sum is σ = 121634022. Its totient is φ = 121634020.

The previous prime is 121633961. The next prime is 121634041. The reversal of 121634021 is 120436121.

It is an a-pointer prime, because the next prime (121634041) can be obtained adding 121634021 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97022500 + 24611521 = 9850^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 121634021 - 2¹⁰ = 121632997 is a prime.

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 = 121633984 and 121634002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121634041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60817010 + 60817011.

It is an arithmetic number, because the mean of its divisors is an integer number (60817011).

Almost surely, 2^121634021 is an apocalyptic number.

It is an amenable number.

121634021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121634021 is an equidigital number, since it uses as much as digits as its factorization.

121634021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 121634021 is about 11028.7814830107. The cubic root of 121634021 is about 495.4711305362.

The spelling of 121634021 in words is "one hundred twenty-one million, six hundred thirty-four thousand, twenty-one".