1224722021 has 8 divisors (see below), whose sum is σ = 1245054720. Its totient is φ = 1204522272.

The previous prime is 1224722017. The next prime is 1224722033. The reversal of 1224722021 is 1202274221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1224722021 - 2² = 1224722017 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 (1224722621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14576 + ... + 51593.

It is an arithmetic number, because the mean of its divisors is an integer number (155631840).

Almost surely, 2^1224722021 is an apocalyptic number.

It is an amenable number.

1224722021 is a deficient number, since it is larger than the sum of its proper divisors (20332699).

1224722021 is an equidigital number, since it uses as much as digits as its factorization.

1224722021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66475.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 1224722021 is about 34996.0286461193. The cubic root of 1224722021 is about 1069.9065400070.

Adding to 1224722021 its reverse (1202274221), we get a palindrome (2426996242).

The spelling of 1224722021 in words is "one billion, two hundred twenty-four million, seven hundred twenty-two thousand, twenty-one".