72408273221 has 2 divisors, whose sum is σ = 72408273222. Its totient is φ = 72408273220.

The previous prime is 72408273151. The next prime is 72408273229. The reversal of 72408273221 is 12237280427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49057377121 + 23350896100 = 221489^2 + 152810^2 .

It is a cyclic number.

It is not a de Polignac number, because 72408273221 - 2²² = 72404078917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72408273229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36204136610 + 36204136611.

It is an arithmetic number, because the mean of its divisors is an integer number (36204136611).

Almost surely, 2^72408273221 is an apocalyptic number.

It is an amenable number.

72408273221 is a deficient number, since it is larger than the sum of its proper divisors (1).

72408273221 is an equidigital number, since it uses as much as digits as its factorization.

72408273221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

The spelling of 72408273221 in words is "seventy-two billion, four hundred eight million, two hundred seventy-three thousand, two hundred twenty-one".