1224041021 has 12 divisors (see below), whose sum is σ = 1507643388. Its totient is φ = 987460992.

The previous prime is 1224040999. The next prime is 1224041033. The reversal of 1224041021 is 1201404221.

It can be written as a sum of positive squares in 2 ways, for example, as 1124260900 + 99780121 = 33530^2 + 9989^2 .

It is not a de Polignac number, because 1224041021 - 2⁶ = 1224040957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224047021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 733886 + ... + 735551.

It is an arithmetic number, because the mean of its divisors is an integer number (125636949).

Almost surely, 2^1224041021 is an apocalyptic number.

It is an amenable number.

1224041021 is a deficient number, since it is larger than the sum of its proper divisors (283602367).

1224041021 is a wasteful number, since it uses less digits than its factorization.

1224041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469468 (or 1469461 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1224041021 is about 34986.2976177817. The cubic root of 1224041021 is about 1069.7081980081.

Adding to 1224041021 its reverse (1201404221), we get a palindrome (2425445242).

The spelling of 1224041021 in words is "one billion, two hundred twenty-four million, forty-one thousand, twenty-one".