1221312334 has 16 divisors (see below), whose sum is σ = 2116071216. Its totient is φ = 522486400.

The previous prime is 1221312329. The next prime is 1221312341. The reversal of 1221312334 is 4332131221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632397 + ... + 1633144.

It is an arithmetic number, because the mean of its divisors is an integer number (132254451).

Almost surely, 2^1221312334 is an apocalyptic number.

1221312334 is a deficient number, since it is larger than the sum of its proper divisors (894758882).

1221312334 is a wasteful number, since it uses less digits than its factorization.

1221312334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265571.

The product of its digits is 864, while the sum is 22.

The square root of 1221312334 is about 34947.2793504730. The cubic root of 1221312334 is about 1068.9127261588.

Adding to 1221312334 its reverse (4332131221), we get a palindrome (5553443555).

The spelling of 1221312334 in words is "one billion, two hundred twenty-one million, three hundred twelve thousand, three hundred thirty-four".