2221573729 has 2 divisors, whose sum is σ = 2221573730. Its totient is φ = 2221573728.

The previous prime is 2221573709. The next prime is 2221573747. The reversal of 2221573729 is 9273751222.

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., 2111218704 + 110355025 = 45948^2 + 10505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221573729 - 2¹³ = 2221565537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221573691 and 2221573700.

It is not a weakly prime, because it can be changed into another prime (2221573709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110786864 + 1110786865.

It is an arithmetic number, because the mean of its divisors is an integer number (1110786865).

Almost surely, 2^2221573729 is an apocalyptic number.

It is an amenable number.

2221573729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221573729 is an equidigital number, since it uses as much as digits as its factorization.

2221573729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 2221573729 is about 47133.5732678947. The cubic root of 2221573729 is about 1304.8289297833.

The spelling of 2221573729 in words is "two billion, two hundred twenty-one million, five hundred seventy-three thousand, seven hundred twenty-nine".