21340562 has 8 divisors (see below), whose sum is σ = 32056716. Its totient is φ = 10654992.

The previous prime is 21340547. The next prime is 21340567. The reversal of 21340562 is 26504312.

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 373321 = 4579^2 + 611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21340567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5813 + ... + 8744.

Almost surely, 2^21340562 is an apocalyptic number.

21340562 is a deficient number, since it is larger than the sum of its proper divisors (10716154).

21340562 is a wasteful number, since it uses less digits than its factorization.

21340562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15292.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21340562 is about 4619.5846133608. The cubic root of 21340562 is about 277.3758316873.

Adding to 21340562 its reverse (26504312), we get a palindrome (47844874).

The spelling of 21340562 in words is "twenty-one million, three hundred forty thousand, five hundred sixty-two".