121213399 has 2 divisors, whose sum is σ = 121213400. Its totient is φ = 121213398.

The previous prime is 121213397. The next prime is 121213403. The reversal of 121213399 is 993312121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121213399 - 2¹ = 121213397 is a prime.

Together with 121213397, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121213399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121213397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606699 + 60606700.

It is an arithmetic number, because the mean of its divisors is an integer number (60606700).

Almost surely, 2^121213399 is an apocalyptic number.

121213399 is a deficient number, since it is larger than the sum of its proper divisors (1).

121213399 is an equidigital number, since it uses as much as digits as its factorization.

121213399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 121213399 is about 11009.6956815345. The cubic root of 121213399 is about 494.8993421828.

The spelling of 121213399 in words is "one hundred twenty-one million, two hundred thirteen thousand, three hundred ninety-nine".