742242221 has 12 divisors (see below), whose sum is σ = 868478112. Its totient is φ = 621401256.

The previous prime is 742242197. The next prime is 742242227. The reversal of 742242221 is 122242247.

It is not a de Polignac number, because 742242221 - 2¹⁰ = 742241197 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 (742242227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15731 + ... + 41616.

It is an arithmetic number, because the mean of its divisors is an integer number (72373176).

Almost surely, 2^742242221 is an apocalyptic number.

It is an amenable number.

742242221 is a deficient number, since it is larger than the sum of its proper divisors (126235891).

742242221 is an equidigital number, since it uses as much as digits as its factorization.

742242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57440 (or 57397 counting only the distinct ones).

The product of its digits is 3584, while the sum is 26.

The square root of 742242221 is about 27244.1226872880. The cubic root of 742242221 is about 905.4168062666.

Adding to 742242221 its sum of digits (26), we get a palindrome (742242247).

Adding to 742242221 its reverse (122242247), we get a palindrome (864484468).

The spelling of 742242221 in words is "seven hundred forty-two million, two hundred forty-two thousand, two hundred twenty-one".