2154221723 has 2 divisors, whose sum is σ = 2154221724. Its totient is φ = 2154221722.

The previous prime is 2154221621. The next prime is 2154221731. The reversal of 2154221723 is 3271224512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2154221723 - 2¹² = 2154217627 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154221743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077110861 + 1077110862.

It is an arithmetic number, because the mean of its divisors is an integer number (1077110862).

Almost surely, 2^2154221723 is an apocalyptic number.

2154221723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154221723 is an equidigital number, since it uses as much as digits as its factorization.

2154221723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 2154221723 is about 46413.5941616247. The cubic root of 2154221723 is about 1291.5071068187.

The spelling of 2154221723 in words is "two billion, one hundred fifty-four million, two hundred twenty-one thousand, seven hundred twenty-three".