76215421 has 2 divisors, whose sum is σ = 76215422. Its totient is φ = 76215420.

The previous prime is 76215409. The next prime is 76215439. The reversal of 76215421 is 12451267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 264196 = 8715^2 + 514^2 .

It is an emirp because it is prime and its reverse (12451267) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76215421 - 2⁵ = 76215389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76215421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76215401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38107710 + 38107711.

It is an arithmetic number, because the mean of its divisors is an integer number (38107711).

Almost surely, 2^76215421 is an apocalyptic number.

It is an amenable number.

76215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

76215421 is an equidigital number, since it uses as much as digits as its factorization.

76215421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 76215421 is about 8730.1443859767. The cubic root of 76215421 is about 423.9821937609.

Adding to 76215421 its reverse (12451267), we get a palindrome (88666688).

It can be divided in two parts, 76215 and 421, that added together give a triangular number (76636 = T₃₉₁).

The spelling of 76215421 in words is "seventy-six million, two hundred fifteen thousand, four hundred twenty-one".