1222121311 has 4 divisors (see below), whose sum is σ = 1234221624. Its totient is φ = 1210021000.

The previous prime is 1222121293. The next prime is 1222121357. The reversal of 1222121311 is 1131212221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222121311 - 2¹⁷ = 1221990239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222121111) 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, 6050005 + ... + 6050206.

It is an arithmetic number, because the mean of its divisors is an integer number (308555406).

Almost surely, 2^1222121311 is an apocalyptic number.

1222121311 is a deficient number, since it is larger than the sum of its proper divisors (12100313).

1222121311 is a wasteful number, since it uses less digits than its factorization.

1222121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100312.

The product of its digits is 48, while the sum is 16.

The square root of 1222121311 is about 34958.8516830859. The cubic root of 1222121311 is about 1069.1486840788.

Adding to 1222121311 its reverse (1131212221), we get a palindrome (2353333532).

The spelling of 1222121311 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, three hundred eleven".