80215621 has 2 divisors, whose sum is σ = 80215622. Its totient is φ = 80215620.

The previous prime is 80215589. The next prime is 80215637. The reversal of 80215621 is 12651208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 37822500 = 6511^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 80215621 - 2⁵ = 80215589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80215691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40107810 + 40107811.

It is an arithmetic number, because the mean of its divisors is an integer number (40107811).

Almost surely, 2^80215621 is an apocalyptic number.

It is an amenable number.

80215621 is a deficient number, since it is larger than the sum of its proper divisors (1).

80215621 is an equidigital number, since it uses as much as digits as its factorization.

80215621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 80215621 is about 8956.3173793697. The cubic root of 80215621 is about 431.2737085334.

Adding to 80215621 its reverse (12651208), we get a palindrome (92866829).

The spelling of 80215621 in words is "eighty million, two hundred fifteen thousand, six hundred twenty-one".