1224040221 has 16 divisors (see below), whose sum is σ = 1823881920. Its totient is φ = 811306800.

The previous prime is 1224040217. The next prime is 1224040231. The reversal of 1224040221 is 1220404221.

1224040221 is a `hidden beast` number, since 1 + 2 + 240 + 402 + 21 = 666.

It is not a de Polignac number, because 1224040221 - 2² = 1224040217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1224040194 and 1224040203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224040201) 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, 126355 + ... + 135696.

It is an arithmetic number, because the mean of its divisors is an integer number (113992620).

Almost surely, 2^1224040221 is an apocalyptic number.

It is an amenable number.

1224040221 is a deficient number, since it is larger than the sum of its proper divisors (599841699).

1224040221 is a wasteful number, since it uses less digits than its factorization.

1224040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262233 (or 262227 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1224040221 is about 34986.2861847324. The cubic root of 1224040221 is about 1069.7079649640.

Adding to 1224040221 its reverse (1220404221), we get a palindrome (2444444442).

The spelling of 1224040221 in words is "one billion, two hundred twenty-four million, forty thousand, two hundred twenty-one".