76912021 has 2 divisors, whose sum is σ = 76912022. Its totient is φ = 76912020.

The previous prime is 76912013. The next prime is 76912037. The reversal of 76912021 is 12021967.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 30140100 = 6839^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 76912021 - 2³ = 76912013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76912051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38456010 + 38456011.

It is an arithmetic number, because the mean of its divisors is an integer number (38456011).

Almost surely, 2^76912021 is an apocalyptic number.

It is an amenable number.

76912021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76912021 is an equidigital number, since it uses as much as digits as its factorization.

76912021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 76912021 is about 8769.9498858317. The cubic root of 76912021 is about 425.2699940704.

Adding to 76912021 its reverse (12021967), we get a palindrome (88933988).

The spelling of 76912021 in words is "seventy-six million, nine hundred twelve thousand, twenty-one".