21622143 has 16 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 14059200.

The previous prime is 21622141. The next prime is 21622151. The reversal of 21622143 is 34122612.

It is not a de Polignac number, because 21622143 - 2¹ = 21622141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26323 + ... + 27131.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800).

Almost surely, 2^21622143 is an apocalyptic number.

21622143 is a deficient number, since it is larger than the sum of its proper divisors (7926657).

21622143 is a wasteful number, since it uses less digits than its factorization.

21622143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022.

The product of its digits is 576, while the sum is 21.

The square root of 21622143 is about 4649.9616127448. The cubic root of 21622143 is about 278.5904629804.

Adding to 21622143 its reverse (34122612), we get a palindrome (55744755).

The spelling of 21622143 in words is "twenty-one million, six hundred twenty-two thousand, one hundred forty-three".