121210399 has 2 divisors, whose sum is σ = 121210400. Its totient is φ = 121210398.

The previous prime is 121210379. The next prime is 121210429. The reversal of 121210399 is 993012121.

It is a weak prime.

It is an emirp because it is prime and its reverse (993012121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210399 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605199 + 60605200.

It is an arithmetic number, because the mean of its divisors is an integer number (60605200).

Almost surely, 2^121210399 is an apocalyptic number.

121210399 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210399 is an equidigital number, since it uses as much as digits as its factorization.

121210399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 121210399 is about 11009.5594371437. The cubic root of 121210399 is about 494.8952592726.

It can be divided in two parts, 1212 and 10399, that added together give a palindrome (11611).

The spelling of 121210399 in words is "one hundred twenty-one million, two hundred ten thousand, three hundred ninety-nine".