121426421 has 2 divisors, whose sum is σ = 121426422. Its totient is φ = 121426420.

The previous prime is 121426387. The next prime is 121426423. The reversal of 121426421 is 124624121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118570321 + 2856100 = 10889^2 + 1690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121426421 is a prime.

Together with 121426423, 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 (121426423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60713210 + 60713211.

It is an arithmetic number, because the mean of its divisors is an integer number (60713211).

Almost surely, 2^121426421 is an apocalyptic number.

It is an amenable number.

121426421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121426421 is an equidigital number, since it uses as much as digits as its factorization.

121426421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 121426421 is about 11019.3657258483. The cubic root of 121426421 is about 495.1890866903.

The spelling of 121426421 in words is "one hundred twenty-one million, four hundred twenty-six thousand, four hundred twenty-one".