121421410009 has 2 divisors, whose sum is σ = 121421410010. Its totient is φ = 121421410008.

The previous prime is 121421410007. The next prime is 121421410027. The reversal of 121421410009 is 900014124121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107667984384 + 13753425625 = 328128^2 + 117275^2 .

It is a cyclic number.

It is not a de Polignac number, because 121421410009 - 2¹ = 121421410007 is a prime.

Together with 121421410007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121421410007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710705004 + 60710705005.

It is an arithmetic number, because the mean of its divisors is an integer number (60710705005).

Almost surely, 2^121421410009 is an apocalyptic number.

It is an amenable number.

121421410009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121421410009 is an equidigital number, since it uses as much as digits as its factorization.

121421410009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 121421410009 in words is "one hundred twenty-one billion, four hundred twenty-one million, four hundred ten thousand, nine".