211421023423 has 16 divisors (see below), whose sum is σ = 214288865280. Its totient is φ = 208574856000.

The previous prime is 211421023343. The next prime is 211421023459. The reversal of 211421023423 is 324320124112.

It is a cyclic number.

It is not a de Polignac number, because 211421023423 - 2²⁵ = 211387468991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421023123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27899211 + ... + 27906787.

It is an arithmetic number, because the mean of its divisors is an integer number (13393054080).

Almost surely, 2^211421023423 is an apocalyptic number.

211421023423 is a deficient number, since it is larger than the sum of its proper divisors (2867841857).

211421023423 is a wasteful number, since it uses less digits than its factorization.

211421023423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8958.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 211421023423 its reverse (324320124112), we get a palindrome (535741147535).

The spelling of 211421023423 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, four hundred twenty-three".