221101211423 has 2 divisors, whose sum is σ = 221101211424. Its totient is φ = 221101211422.

The previous prime is 221101211413. The next prime is 221101211479. The reversal of 221101211423 is 324112101122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221101211423 - 2⁴ = 221101211407 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221101211395 and 221101211404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221101211413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550605711 + 110550605712.

It is an arithmetic number, because the mean of its divisors is an integer number (110550605712).

Almost surely, 2^221101211423 is an apocalyptic number.

221101211423 is a deficient number, since it is larger than the sum of its proper divisors (1).

221101211423 is an equidigital number, since it uses as much as digits as its factorization.

221101211423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 221101211423 its reverse (324112101122), we get a palindrome (545213312545).

The spelling of 221101211423 in words is "two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, four hundred twenty-three".