1222311321 has 36 divisors (see below), whose sum is σ = 2240535024. Its totient is φ = 634964400.

The previous prime is 1222311313. The next prime is 1222311331. The reversal of 1222311321 is 1231132221.

1222311321 is a `hidden beast` number, since 12 + 22 + 311 + 321 = 666.

It is not a de Polignac number, because 1222311321 - 2³ = 1222311313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222311294 and 1222311303.

It is not an unprimeable number, because it can be changed into a prime (1222311301) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 121135 + ... + 130836.

It is an arithmetic number, because the mean of its divisors is an integer number (62237084).

Almost surely, 2^1222311321 is an apocalyptic number.

1222311321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222311321 is a deficient number, since it is larger than the sum of its proper divisors (1018223703).

1222311321 is a wasteful number, since it uses less digits than its factorization.

1222311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252002 (or 251992 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1222311321 is about 34961.5692010527. The cubic root of 1222311321 is about 1069.2040900390.

Adding to 1222311321 its reverse (1231132221), we get a palindrome (2453443542).

Subtracting 1222311321 from its reverse (1231132221), we obtain a square (8820900 = 2970²).

The spelling of 1222311321 in words is "one billion, two hundred twenty-two million, three hundred eleven thousand, three hundred twenty-one".