1242024221 has 4 divisors (see below), whose sum is σ = 1253632032. Its totient is φ = 1230416412.

The previous prime is 1242024197. The next prime is 1242024227. The reversal of 1242024221 is 1224202421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242024221 - 2¹⁰ = 1242023197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242024193 and 1242024202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242024227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5803745 + ... + 5803958.

It is an arithmetic number, because the mean of its divisors is an integer number (313408008).

Almost surely, 2^1242024221 is an apocalyptic number.

It is an amenable number.

1242024221 is a deficient number, since it is larger than the sum of its proper divisors (11607811).

1242024221 is a wasteful number, since it uses less digits than its factorization.

1242024221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11607810.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1242024221 is about 35242.3640098107. The cubic root of 1242024221 is about 1074.9213487797.

Adding to 1242024221 its reverse (1224202421), we get a palindrome (2466226642).

The spelling of 1242024221 in words is "one billion, two hundred forty-two million, twenty-four thousand, two hundred twenty-one".