1224723213 has 16 divisors (see below), whose sum is σ = 2073605760. Its totient is φ = 699841728.

The previous prime is 1224723211. The next prime is 1224723277. The reversal of 1224723213 is 3123274221.

It is not a de Polignac number, because 1224723213 - 2¹ = 1224723211 is a prime.

It is a super-2 number, since 2×1224723213² = 2999893896922086738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224723211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3239820 + ... + 3240197.

It is an arithmetic number, because the mean of its divisors is an integer number (129600360).

Almost surely, 2^1224723213 is an apocalyptic number.

It is an amenable number.

1224723213 is a deficient number, since it is larger than the sum of its proper divisors (848882547).

1224723213 is an equidigital number, since it uses as much as digits as its factorization.

1224723213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480033 (or 6480027 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 1224723213 is about 34996.0456766190. The cubic root of 1224723213 is about 1069.9068871139.

Adding to 1224723213 its reverse (3123274221), we get a palindrome (4347997434).

The spelling of 1224723213 in words is "one billion, two hundred twenty-four million, seven hundred twenty-three thousand, two hundred thirteen".