21341836 has 6 divisors (see below), whose sum is σ = 37348220. Its totient is φ = 10670916.

The previous prime is 21341833. The next prime is 21341839. The reversal of 21341836 is 63814312.

It is an interprime number because it is at equal distance from previous prime (21341833) and next prime (21341839).

It is not an unprimeable number, because it can be changed into a prime (21341833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667726 + ... + 2667733.

Almost surely, 2^21341836 is an apocalyptic number.

It is an amenable number.

21341836 is a deficient number, since it is larger than the sum of its proper divisors (16006384).

21341836 is a wasteful number, since it uses less digits than its factorization.

21341836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335463 (or 5335461 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 21341836 is about 4619.7225024887. The cubic root of 21341836 is about 277.3813512199.

The spelling of 21341836 in words is "twenty-one million, three hundred forty-one thousand, eight hundred thirty-six".