76061221 has 4 divisors (see below), whose sum is σ = 76079212. Its totient is φ = 76043232.

The previous prime is 76061203. The next prime is 76061231. The reversal of 76061221 is 12216067.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12216067 = 457 ⋅26731.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 63776196 = 3505^2 + 7986^2 .

It is a cyclic number.

It is not a de Polignac number, because 76061221 - 2⁹ = 76060709 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 (76061231) 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, 1195 + ... + 12391.

It is an arithmetic number, because the mean of its divisors is an integer number (19019803).

Almost surely, 2^76061221 is an apocalyptic number.

It is an amenable number.

76061221 is a deficient number, since it is larger than the sum of its proper divisors (17991).

76061221 is a wasteful number, since it uses less digits than its factorization.

76061221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17990.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 76061221 is about 8721.3084454112. The cubic root of 76061221 is about 423.6960653358.

Adding to 76061221 its reverse (12216067), we get a palindrome (88277288).

The spelling of 76061221 in words is "seventy-six million, sixty-one thousand, two hundred twenty-one".