211422421 has 8 divisors (see below), whose sum is σ = 255839040. Its totient is φ = 170559168.

The previous prime is 211422413. The next prime is 211422427. The reversal of 211422421 is 124224112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211422421 - 2³ = 211422413 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 (211422427) 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 in 7 ways as a sum of consecutive naturals, for example, 888211 + ... + 888448.

It is an arithmetic number, because the mean of its divisors is an integer number (31979880).

Almost surely, 2^211422421 is an apocalyptic number.

It is an amenable number.

211422421 is a deficient number, since it is larger than the sum of its proper divisors (44416619).

211422421 is a wasteful number, since it uses less digits than its factorization.

211422421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776683.

The product of its digits is 256, while the sum is 19.

The square root of 211422421 is about 14540.3721066553. The cubic root of 211422421 is about 595.7312018904.

Adding to 211422421 its reverse (124224112), we get a palindrome (335646533).

The spelling of 211422421 in words is "two hundred eleven million, four hundred twenty-two thousand, four hundred twenty-one".