221074729 has 2 divisors, whose sum is σ = 221074730. Its totient is φ = 221074728.

The previous prime is 221074703. The next prime is 221074751. The reversal of 221074729 is 927470122.

It is a happy number.

221074729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218005225 + 3069504 = 14765^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 221074729 - 2¹³ = 221066537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221074694 and 221074703.

It is not a weakly prime, because it can be changed into another prime (221072729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110537364 + 110537365.

It is an arithmetic number, because the mean of its divisors is an integer number (110537365).

Almost surely, 2^221074729 is an apocalyptic number.

It is an amenable number.

221074729 is a deficient number, since it is larger than the sum of its proper divisors (1).

221074729 is an equidigital number, since it uses as much as digits as its factorization.

221074729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 221074729 is about 14868.5819431444. The cubic root of 221074729 is about 604.6624978220.

The spelling of 221074729 in words is "two hundred twenty-one million, seventy-four thousand, seven hundred twenty-nine".