211021423 has 2 divisors, whose sum is σ = 211021424. Its totient is φ = 211021422.

The previous prime is 211021417. The next prime is 211021427. The reversal of 211021423 is 324120112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211021423 - 2⁹ = 211020911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211021397 and 211021406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510711 + 105510712.

It is an arithmetic number, because the mean of its divisors is an integer number (105510712).

Almost surely, 2^211021423 is an apocalyptic number.

211021423 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021423 is an equidigital number, since it uses as much as digits as its factorization.

211021423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 211021423 is about 14526.5764376883. The cubic root of 211021423 is about 595.3543288851.

Adding to 211021423 its reverse (324120112), we get a palindrome (535141535).

The spelling of 211021423 in words is "two hundred eleven million, twenty-one thousand, four hundred twenty-three".