121402427 has 2 divisors, whose sum is σ = 121402428. Its totient is φ = 121402426.

The previous prime is 121402367. The next prime is 121402429. The reversal of 121402427 is 724204121.

It is a strong prime.

It is an emirp because it is prime and its reverse (724204121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121402427 - 2²² = 117208123 is a prime.

Together with 121402429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121402429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60701213 + 60701214.

It is an arithmetic number, because the mean of its divisors is an integer number (60701214).

Almost surely, 2^121402427 is an apocalyptic number.

121402427 is a deficient number, since it is larger than the sum of its proper divisors (1).

121402427 is an equidigital number, since it uses as much as digits as its factorization.

121402427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 121402427 is about 11018.2769524096. The cubic root of 121402427 is about 495.1564678980.

Adding to 121402427 its reverse (724204121), we get a palindrome (845606548).

The spelling of 121402427 in words is "one hundred twenty-one million, four hundred two thousand, four hundred twenty-seven".