21004622 has 16 divisors (see below), whose sum is σ = 33562512. Its totient is φ = 9824640.

The previous prime is 21004619. The next prime is 21004631. The reversal of 21004622 is 22640012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21004622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4097 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (2097657).

Almost surely, 2^21004622 is an apocalyptic number.

21004622 is a deficient number, since it is larger than the sum of its proper divisors (12557890).

21004622 is a wasteful number, since it uses less digits than its factorization.

21004622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3763.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21004622 is about 4583.0799687546. The cubic root of 21004622 is about 275.9126570224.

Adding to 21004622 its reverse (22640012), we get a palindrome (43644634).

The spelling of 21004622 in words is "twenty-one million, four thousand, six hundred twenty-two".