21353422 has 4 divisors (see below), whose sum is σ = 32030136. Its totient is φ = 10676710.

The previous prime is 21353419. The next prime is 21353441. The reversal of 21353422 is 22435312.

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

It is a super-2 number, since 2×21353422² = 911937262220168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21353393 and 21353402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338354 + ... + 5338357.

It is an arithmetic number, because the mean of its divisors is an integer number (8007534).

Almost surely, 2^21353422 is an apocalyptic number.

21353422 is a deficient number, since it is larger than the sum of its proper divisors (10676714).

21353422 is a wasteful number, since it uses less digits than its factorization.

21353422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10676713.

The product of its digits is 1440, while the sum is 22.

The square root of 21353422 is about 4620.9763037696. The cubic root of 21353422 is about 277.4315368264.

Adding to 21353422 its reverse (22435312), we get a palindrome (43788734).

It can be divided in two parts, 213 and 53422, that added together give a palindrome (53635).

The spelling of 21353422 in words is "twenty-one million, three hundred fifty-three thousand, four hundred twenty-two".