21422211 has 8 divisors (see below), whose sum is σ = 28884240. Its totient is φ = 14120832.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422211 is 11222412.

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

It is not a de Polignac number, because 21422211 - 2¹⁴ = 21405827 is a prime.

It is a super-2 number, since 2×21422211² = 917822248257042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21422221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39850 + ... + 40383.

It is an arithmetic number, because the mean of its divisors is an integer number (3610530).

Almost surely, 2^21422211 is an apocalyptic number.

21422211 is a deficient number, since it is larger than the sum of its proper divisors (7462029).

21422211 is an equidigital number, since it uses as much as digits as its factorization.

21422211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80325.

The product of its digits is 64, while the sum is 15.

The square root of 21422211 is about 4628.4134430710. The cubic root of 21422211 is about 277.7291281853.

Adding to 21422211 its reverse (11222412), we get a palindrome (32644623).

The spelling of 21422211 in words is "twenty-one million, four hundred twenty-two thousand, two hundred eleven".