76180021 has 2 divisors, whose sum is σ = 76180022. Its totient is φ = 76180020.

The previous prime is 76180001. The next prime is 76180057. The reversal of 76180021 is 12008167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51279921 + 24900100 = 7161^2 + 4990^2 .

It is an emirp because it is prime and its reverse (12008167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76180021 - 2⁷ = 76179893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76180001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38090010 + 38090011.

It is an arithmetic number, because the mean of its divisors is an integer number (38090011).

Almost surely, 2^76180021 is an apocalyptic number.

It is an amenable number.

76180021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76180021 is an equidigital number, since it uses as much as digits as its factorization.

76180021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 76180021 is about 8728.1166926205. The cubic root of 76180021 is about 423.9165408444.

Adding to 76180021 its reverse (12008167), we get a palindrome (88188188).

The spelling of 76180021 in words is "seventy-six million, one hundred eighty thousand, twenty-one".