21836468 has 6 divisors (see below), whose sum is σ = 38213826. Its totient is φ = 10918232.

The previous prime is 21836467. The next prime is 21836471. The reversal of 21836468 is 86463812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 195364 = 4652^2 + 442^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21836461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2729555 + ... + 2729562.

It is an arithmetic number, because the mean of its divisors is an integer number (6368971).

Almost surely, 2^21836468 is an apocalyptic number.

It is an amenable number.

21836468 is a deficient number, since it is larger than the sum of its proper divisors (16377358).

21836468 is a wasteful number, since it uses less digits than its factorization.

21836468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459121 (or 5459119 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 21836468 is about 4672.9506738248. The cubic root of 21836468 is about 279.5079282572.

The spelling of 21836468 in words is "twenty-one million, eight hundred thirty-six thousand, four hundred sixty-eight".