21622042 has 8 divisors (see below), whose sum is σ = 34927956. Its totient is φ = 9979392.

The previous prime is 21622037. The next prime is 21622061. The reversal of 21622042 is 24022612.

It can be written as a sum of positive squares in 2 ways, for example, as 19000881 + 2621161 = 4359^2 + 1619^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415783 + ... + 415834.

Almost surely, 2^21622042 is an apocalyptic number.

21622042 is a deficient number, since it is larger than the sum of its proper divisors (13305914).

21622042 is a wasteful number, since it uses less digits than its factorization.

21622042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831632.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21622042 is about 4649.9507524274. The cubic root of 21622042 is about 278.5900292016.

Adding to 21622042 its reverse (24022612), we get a palindrome (45644654).

The spelling of 21622042 in words is "twenty-one million, six hundred twenty-two thousand, forty-two".