21618050 has 48 divisors (see below), whose sum is σ = 44093160. Its totient is φ = 7848960.

The previous prime is 21618041. The next prime is 21618053. The reversal of 21618050 is 5081612.

It can be written as a sum of positive squares in 12 ways, for example, as 6880129 + 14737921 = 2623^2 + 3839^2 .

It is not an unprimeable number, because it can be changed into a prime (21618053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24212 + ... + 25088.

Almost surely, 2^21618050 is an apocalyptic number.

21618050 is an abundant number, since it is smaller than the sum of its proper divisors (22475110).

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

21618050 is a wasteful number, since it uses less digits than its factorization.

21618050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 930 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 21618050 is about 4649.5214807548. The cubic root of 21618050 is about 278.5728831207.

Adding to 21618050 its reverse (5081612), we get a palindrome (26699662).

The spelling of 21618050 in words is "twenty-one million, six hundred eighteen thousand, fifty".