21436346 has 4 divisors (see below), whose sum is σ = 32154522. Its totient is φ = 10718172.

The previous prime is 21436343. The next prime is 21436361. The reversal of 21436346 is 64363412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19018321 + 2418025 = 4361^2 + 1555^2 .

It is not an unprimeable number, because it can be changed into a prime (21436343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5359085 + ... + 5359088.

Almost surely, 2^21436346 is an apocalyptic number.

21436346 is a deficient number, since it is larger than the sum of its proper divisors (10718176).

21436346 is a wasteful number, since it uses less digits than its factorization.

21436346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10718175.

The product of its digits is 10368, while the sum is 29.

The square root of 21436346 is about 4629.9401723996. The cubic root of 21436346 is about 277.7901993497.

Adding to 21436346 its reverse (64363412), we get a palindrome (85799758).

The spelling of 21436346 in words is "twenty-one million, four hundred thirty-six thousand, three hundred forty-six".