1224440921 has 16 divisors (see below), whose sum is σ = 1411128000. Its totient is φ = 1050739200.

The previous prime is 1224440897. The next prime is 1224440923. The reversal of 1224440921 is 1290444221.

It is a cyclic number.

It is not a de Polignac number, because 1224440921 - 2¹⁰ = 1224439897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224440923) 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, 48305 + ... + 69153.

It is an arithmetic number, because the mean of its divisors is an integer number (88195500).

Almost surely, 2^1224440921 is an apocalyptic number.

1224440921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1224440921 is a deficient number, since it is larger than the sum of its proper divisors (186687079).

1224440921 is a wasteful number, since it uses less digits than its factorization.

1224440921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21160.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1224440921 is about 34992.0122456540. The cubic root of 1224440921 is about 1069.8246782360.

The spelling of 1224440921 in words is "one billion, two hundred twenty-four million, four hundred forty thousand, nine hundred twenty-one".