21618034 has 16 divisors (see below), whose sum is σ = 33390720. Its totient is φ = 10492560.

The previous prime is 21618007. The next prime is 21618041. The reversal of 21618034 is 43081612.

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, 8517 + ... + 10759.

It is an arithmetic number, because the mean of its divisors is an integer number (2086920).

Almost surely, 2^21618034 is an apocalyptic number.

21618034 is a deficient number, since it is larger than the sum of its proper divisors (11772686).

21618034 is a wasteful number, since it uses less digits than its factorization.

21618034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21618034 is about 4649.5197601473. The cubic root of 21618034 is about 278.5728143947.

Adding to 21618034 its reverse (43081612), we get a palindrome (64699646).

The spelling of 21618034 in words is "twenty-one million, six hundred eighteen thousand, thirty-four".