76427221 has 4 divisors (see below), whose sum is σ = 82306252. Its totient is φ = 70548192.

The previous prime is 76427213. The next prime is 76427233. The reversal of 76427221 is 12272467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12272467 = 1009 ⋅12163.

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 40259025 = 6014^2 + 6345^2 .

It is not a de Polignac number, because 76427221 - 2³ = 76427213 is a prime.

It is a super-2 number, since 2×76427221² = 11682240219565682, 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 (76427251) 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, 2939496 + ... + 2939521.

It is an arithmetic number, because the mean of its divisors is an integer number (20576563).

Almost surely, 2^76427221 is an apocalyptic number.

It is an amenable number.

76427221 is a deficient number, since it is larger than the sum of its proper divisors (5879031).

76427221 is a wasteful number, since it uses less digits than its factorization.

76427221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5879030.

The product of its digits is 9408, while the sum is 31.

The square root of 76427221 is about 8742.2663537552. The cubic root of 76427221 is about 424.3745744300.

Adding to 76427221 its reverse (12272467), we get a palindrome (88699688).

The spelling of 76427221 in words is "seventy-six million, four hundred twenty-seven thousand, two hundred twenty-one".