21042622 has 4 divisors (see below), whose sum is σ = 31563936. Its totient is φ = 10521310.

The previous prime is 21042601. The next prime is 21042629. The reversal of 21042622 is 22624012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21042622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260654 + ... + 5260657.

It is an arithmetic number, because the mean of its divisors is an integer number (7890984).

Almost surely, 2^21042622 is an apocalyptic number.

21042622 is a deficient number, since it is larger than the sum of its proper divisors (10521314).

21042622 is a wasteful number, since it uses less digits than its factorization.

21042622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521313.

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

The square root of 21042622 is about 4587.2237791501. The cubic root of 21042622 is about 276.0789436714.

Adding to 21042622 its reverse (22624012), we get a palindrome (43666634).

The spelling of 21042622 in words is "twenty-one million, forty-two thousand, six hundred twenty-two".