21622406 has 8 divisors (see below), whose sum is σ = 34928544. Its totient is φ = 9979560.

The previous prime is 21622339. The next prime is 21622417. The reversal of 21622406 is 60422612.

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

It is a congruent number.

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, 415790 + ... + 415841.

It is an arithmetic number, because the mean of its divisors is an integer number (4366068).

Almost surely, 2^21622406 is an apocalyptic number.

21622406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21622406 is a deficient number, since it is larger than the sum of its proper divisors (13306138).

21622406 is a wasteful number, since it uses less digits than its factorization.

21622406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831646.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21622406 is about 4649.9898924621. The cubic root of 21622406 is about 278.5915925168.

It can be divided in two parts, 216 and 22406, that added together give a palindrome (22622).

The spelling of 21622406 in words is "twenty-one million, six hundred twenty-two thousand, four hundred six".