21342211 has 4 divisors (see below), whose sum is σ = 23282424. Its totient is φ = 19402000.

The previous prime is 21342203. The next prime is 21342221. The reversal of 21342211 is 11224312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21342211 - 2³ = 21342203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970090 + ... + 970111.

It is an arithmetic number, because the mean of its divisors is an integer number (5820606).

Almost surely, 2^21342211 is an apocalyptic number.

21342211 is a deficient number, since it is larger than the sum of its proper divisors (1940213).

21342211 is a wasteful number, since it uses less digits than its factorization.

21342211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940212.

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

The square root of 21342211 is about 4619.7630891638. The cubic root of 21342211 is about 277.3829758442.

Adding to 21342211 its reverse (11224312), we get a palindrome (32566523).

It can be divided in two parts, 213 and 42211, that added together give a palindrome (42424).

The spelling of 21342211 in words is "twenty-one million, three hundred forty-two thousand, two hundred eleven".