76213021 has 2 divisors, whose sum is σ = 76213022. Its totient is φ = 76213020.

The previous prime is 76213019. The next prime is 76213043. The reversal of 76213021 is 12031267.

It is an a-pointer prime, because the next prime (76213043) can be obtained adding 76213021 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76212900 + 121 = 8730^2 + 11^2 .

It is an emirp because it is prime and its reverse (12031267) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76213021 - 2¹ = 76213019 is a prime.

Together with 76213019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 76212983 and 76213001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76213001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38106510 + 38106511.

It is an arithmetic number, because the mean of its divisors is an integer number (38106511).

Almost surely, 2^76213021 is an apocalyptic number.

It is an amenable number.

76213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76213021 is an equidigital number, since it uses as much as digits as its factorization.

76213021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 76213021 is about 8730.0069301233. The cubic root of 76213021 is about 423.9777433582.

Adding to 76213021 its reverse (12031267), we get a palindrome (88244288).

The spelling of 76213021 in words is "seventy-six million, two hundred thirteen thousand, twenty-one".