2221351723 has 2 divisors, whose sum is σ = 2221351724. Its totient is φ = 2221351722.

The previous prime is 2221351703. The next prime is 2221351763. The reversal of 2221351723 is 3271531222.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221351723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221351691 and 2221351700.

It is not a weakly prime, because it can be changed into another prime (2221351703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110675861 + 1110675862.

It is an arithmetic number, because the mean of its divisors is an integer number (1110675862).

Almost surely, 2^2221351723 is an apocalyptic number.

2221351723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221351723 is an equidigital number, since it uses as much as digits as its factorization.

2221351723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 2221351723 is about 47131.2181361781. The cubic root of 2221351723 is about 1304.7854636737.

Adding to 2221351723 its reverse (3271531222), we get a palindrome (5492882945).

The spelling of 2221351723 in words is "two billion, two hundred twenty-one million, three hundred fifty-one thousand, seven hundred twenty-three".