211231723 has 2 divisors, whose sum is σ = 211231724. Its totient is φ = 211231722.

The previous prime is 211231697. The next prime is 211231729. The reversal of 211231723 is 327132112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211231723 - 2¹³ = 211223531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211231694 and 211231703.

It is not a weakly prime, because it can be changed into another prime (211231729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615861 + 105615862.

It is an arithmetic number, because the mean of its divisors is an integer number (105615862).

Almost surely, 2^211231723 is an apocalyptic number.

211231723 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231723 is an equidigital number, since it uses as much as digits as its factorization.

211231723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 22.

The square root of 211231723 is about 14533.8130922343. The cubic root of 211231723 is about 595.5520362157.

Adding to 211231723 its reverse (327132112), we get a palindrome (538363835).

The spelling of 211231723 in words is "two hundred eleven million, two hundred thirty-one thousand, seven hundred twenty-three".