80218921 has 2 divisors, whose sum is σ = 80218922. Its totient is φ = 80218920.

The previous prime is 80218861. The next prime is 80218927. The reversal of 80218921 is 12981208.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80192025 + 26896 = 8955^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 80218921 - 2⁹ = 80218409 is a prime.

It is not a weakly prime, because it can be changed into another prime (80218927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40109460 + 40109461.

It is an arithmetic number, because the mean of its divisors is an integer number (40109461).

Almost surely, 2^80218921 is an apocalyptic number.

It is an amenable number.

80218921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80218921 is an equidigital number, since it uses as much as digits as its factorization.

80218921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 80218921 is about 8956.5016049795. The cubic root of 80218921 is about 431.2796225259.

The spelling of 80218921 in words is "eighty million, two hundred eighteen thousand, nine hundred twenty-one".