21443422 has 32 divisors (see below), whose sum is σ = 43190784. Its totient is φ = 7711200.

The previous prime is 21443363. The next prime is 21443431. The reversal of 21443422 is 22434412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21443393 and 21443402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3354 + ... + 7357.

It is an arithmetic number, because the mean of its divisors is an integer number (1349712).

Almost surely, 2^21443422 is an apocalyptic number.

21443422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21443422 is an abundant number, since it is smaller than the sum of its proper divisors (21747362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443422 is a wasteful number, since it uses less digits than its factorization.

21443422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10744.

The product of its digits is 1536, while the sum is 22.

The square root of 21443422 is about 4630.7042660917. The cubic root of 21443422 is about 277.8207615735.

Adding to 21443422 its reverse (22434412), we get a palindrome (43877834).

The spelling of 21443422 in words is "twenty-one million, four hundred forty-three thousand, four hundred twenty-two".