1222093721 has 4 divisors (see below), whose sum is σ = 1233305700. Its totient is φ = 1210881744.

The previous prime is 1222093711. The next prime is 1222093723. The reversal of 1222093721 is 1273902221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 705168025 + 516925696 = 26555^2 + 22736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222093721 - 2¹⁸ = 1221831577 is a prime.

It is a super-3 number, since 3×1222093721³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1222093723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5605826 + ... + 5606043.

It is an arithmetic number, because the mean of its divisors is an integer number (308326425).

Almost surely, 2^1222093721 is an apocalyptic number.

It is an amenable number.

1222093721 is a deficient number, since it is larger than the sum of its proper divisors (11211979).

1222093721 is a wasteful number, since it uses less digits than its factorization.

1222093721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11211978.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1222093721 is about 34958.4570740758. The cubic root of 1222093721 is about 1069.1406384961.

Adding to 1222093721 its reverse (1273902221), we get a palindrome (2495995942).

The spelling of 1222093721 in words is "one billion, two hundred twenty-two million, ninety-three thousand, seven hundred twenty-one".