21344156 has 6 divisors (see below), whose sum is σ = 37352280. Its totient is φ = 10672076.

The previous prime is 21344131. The next prime is 21344159. The reversal of 21344156 is 65144312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668016 + ... + 2668023.

It is an arithmetic number, because the mean of its divisors is an integer number (6225380).

Almost surely, 2^21344156 is an apocalyptic number.

It is an amenable number.

21344156 is a deficient number, since it is larger than the sum of its proper divisors (16008124).

21344156 is a wasteful number, since it uses less digits than its factorization.

21344156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336043 (or 5336041 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 21344156 is about 4619.9735929981. The cubic root of 21344156 is about 277.3914019237.

Adding to 21344156 its reverse (65144312), we get a palindrome (86488468).

The spelling of 21344156 in words is "twenty-one million, three hundred forty-four thousand, one hundred fifty-six".