1211324399 has 4 divisors (see below), whose sum is σ = 1213197264. Its totient is φ = 1209451536.

The previous prime is 1211324369. The next prime is 1211324407. The reversal of 1211324399 is 9934231121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9934231121 = 37 ⋅268492733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211324399 is a prime.

It is a super-2 number, since 2×1211324399² = 2934613599225422402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211324329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935462 + ... + 936755.

It is an arithmetic number, because the mean of its divisors is an integer number (303299316).

Almost surely, 2^1211324399 is an apocalyptic number.

1211324399 is a deficient number, since it is larger than the sum of its proper divisors (1872865).

1211324399 is an equidigital number, since it uses as much as digits as its factorization.

1211324399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872864.

The product of its digits is 11664, while the sum is 35.

The square root of 1211324399 is about 34804.0859526579. The cubic root of 1211324399 is about 1065.9908780740.

The spelling of 1211324399 in words is "one billion, two hundred eleven million, three hundred twenty-four thousand, three hundred ninety-nine".