21036422 has 16 divisors (see below), whose sum is σ = 34495632. Its totient is φ = 9541920.

The previous prime is 21036413. The next prime is 21036443. The reversal of 21036422 is 22463012.

It is a junction number, because it is equal to n+sod(n) for n = 21036394 and 21036403.

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, 16388 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (2155977).

Almost surely, 2^21036422 is an apocalyptic number.

21036422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21036422 is a deficient number, since it is larger than the sum of its proper divisors (13459210).

21036422 is a wasteful number, since it uses less digits than its factorization.

21036422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21036422 is about 4586.5479393548. The cubic root of 21036422 is about 276.0518263665.

Adding to 21036422 its reverse (22463012), we get a palindrome (43499434).

The spelling of 21036422 in words is "twenty-one million, thirty-six thousand, four hundred twenty-two".