1447542221 has 4 divisors (see below), whose sum is σ = 1497457500. Its totient is φ = 1397626944.

The previous prime is 1447542203. The next prime is 1447542223. The reversal of 1447542221 is 1222457441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1243338121 + 204204100 = 35261^2 + 14290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1447542221 - 2¹⁰ = 1447541197 is a prime.

It is a super-2 number, since 2×1447542221² = 4190756963155225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1447542223) 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 3 ways as a sum of consecutive naturals, for example, 24957596 + ... + 24957653.

It is an arithmetic number, because the mean of its divisors is an integer number (374364375).

Almost surely, 2^1447542221 is an apocalyptic number.

It is an amenable number.

1447542221 is a deficient number, since it is larger than the sum of its proper divisors (49915279).

1447542221 is an equidigital number, since it uses as much as digits as its factorization.

1447542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49915278.

The product of its digits is 17920, while the sum is 32.

The square root of 1447542221 is about 38046.5796228781. The cubic root of 1447542221 is about 1131.2113308272.

Adding to 1447542221 its reverse (1222457441), we get a palindrome (2669999662).

The spelling of 1447542221 in words is "one billion, four hundred forty-seven million, five hundred forty-two thousand, two hundred twenty-one".