72494000221 has 2 divisors, whose sum is σ = 72494000222. Its totient is φ = 72494000220.

The previous prime is 72494000197. The next prime is 72494000231. The reversal of 72494000221 is 12200049427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62493000196 + 10001000025 = 249986^2 + 100005^2 .

It is a cyclic number.

It is not a de Polignac number, because 72494000221 - 2⁷ = 72494000093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72494000231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36247000110 + 36247000111.

It is an arithmetic number, because the mean of its divisors is an integer number (36247000111).

Almost surely, 2^72494000221 is an apocalyptic number.

It is an amenable number.

72494000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

72494000221 is an equidigital number, since it uses as much as digits as its factorization.

72494000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 72494000221 its reverse (12200049427), we get a palindrome (84694049648).

The spelling of 72494000221 in words is "seventy-two billion, four hundred ninety-four million, two hundred twenty-one", and thus it is an aban number.