742401221 has 4 divisors (see below), whose sum is σ = 742480512. Its totient is φ = 742321932.

The previous prime is 742401217. The next prime is 742401229. The reversal of 742401221 is 122104247.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 742401221 - 2² = 742401217 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 (742401229) 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, 23375 + ... + 45068.

It is an arithmetic number, because the mean of its divisors is an integer number (185620128).

Almost surely, 2^742401221 is an apocalyptic number.

It is an amenable number.

742401221 is a deficient number, since it is larger than the sum of its proper divisors (79291).

742401221 is a wasteful number, since it uses less digits than its factorization.

742401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79290.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 742401221 is about 27247.0405915945. The cubic root of 742401221 is about 905.4814531747.

Adding to 742401221 its reverse (122104247), we get a palindrome (864505468).

The spelling of 742401221 in words is "seven hundred forty-two million, four hundred one thousand, two hundred twenty-one".