121153421 has 2 divisors, whose sum is σ = 121153422. Its totient is φ = 121153420.

The previous prime is 121153399. The next prime is 121153423. The reversal of 121153421 is 124351121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 373321 = 10990^2 + 611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121153421 is a prime.

Together with 121153423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121153393 and 121153402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121153423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60576710 + 60576711.

It is an arithmetic number, because the mean of its divisors is an integer number (60576711).

Almost surely, 2^121153421 is an apocalyptic number.

It is an amenable number.

121153421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121153421 is an equidigital number, since it uses as much as digits as its factorization.

121153421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 121153421 is about 11006.9714726622. The cubic root of 121153421 is about 494.8177011261.

The spelling of 121153421 in words is "one hundred twenty-one million, one hundred fifty-three thousand, four hundred twenty-one".