21815034 has 32 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 6988800.

The previous prime is 21815033. The next prime is 21815039. The reversal of 21815034 is 43051812.

It is a junction number, because it is equal to n+sod(n) for n = 21814995 and 21815013.

It is not an unprimeable number, because it can be changed into a prime (21815033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16842 + ... + 18090.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^21815034 is an apocalyptic number.

21815034 is an abundant number, since it is smaller than the sum of its proper divisors (23544966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21815034 is a wasteful number, since it uses less digits than its factorization.

21815034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21815034 is about 4670.6566990093. The cubic root of 21815034 is about 279.4164462130.

Adding to 21815034 its reverse (43051812), we get a palindrome (64866846).

The spelling of 21815034 in words is "twenty-one million, eight hundred fifteen thousand, thirty-four".