1222400211 has 4 divisors (see below), whose sum is σ = 1629866952. Its totient is φ = 814933472.

The previous prime is 1222400209. The next prime is 1222400239. The reversal of 1222400211 is 1120042221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1120042221 = 3 ⋅373347407.

It is a cyclic number.

It is not a de Polignac number, because 1222400211 - 2¹ = 1222400209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222400261) 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, 203733366 + ... + 203733371.

It is an arithmetic number, because the mean of its divisors is an integer number (407466738).

Almost surely, 2^1222400211 is an apocalyptic number.

1222400211 is a deficient number, since it is larger than the sum of its proper divisors (407466741).

1222400211 is an equidigital number, since it uses as much as digits as its factorization.

1222400211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407466740.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1222400211 is about 34962.8404309490. The cubic root of 1222400211 is about 1069.2300079444.

Adding to 1222400211 its reverse (1120042221), we get a palindrome (2342442432).

The spelling of 1222400211 in words is "one billion, two hundred twenty-two million, four hundred thousand, two hundred eleven".