21361084 has 12 divisors (see below), whose sum is σ = 37416400. Its totient is φ = 10670688.

The previous prime is 21361079. The next prime is 21361091. The reversal of 21361084 is 48016312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4777 + ... + 8095.

Almost surely, 2^21361084 is an apocalyptic number.

It is an amenable number.

21361084 is a deficient number, since it is larger than the sum of its proper divisors (16055316).

21361084 is a wasteful number, since it uses less digits than its factorization.

21361084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932 (or 4930 counting only the distinct ones).

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

The square root of 21361084 is about 4621.8052749981. The cubic root of 21361084 is about 277.4647153687.

Adding to 21361084 its reverse (48016312), we get a palindrome (69377396).

The spelling of 21361084 in words is "twenty-one million, three hundred sixty-one thousand, eighty-four".