21353086 has 4 divisors (see below), whose sum is σ = 32029632. Its totient is φ = 10676542.

The previous prime is 21353081. The next prime is 21353119. The reversal of 21353086 is 68035312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338270 + ... + 5338273.

It is an arithmetic number, because the mean of its divisors is an integer number (8007408).

Almost surely, 2^21353086 is an apocalyptic number.

21353086 is a deficient number, since it is larger than the sum of its proper divisors (10676546).

21353086 is a wasteful number, since it uses less digits than its factorization.

21353086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10676545.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21353086 is about 4620.9399476730. The cubic root of 21353086 is about 277.4300816735.

Adding to 21353086 its reverse (68035312), we get a palindrome (89388398).

The spelling of 21353086 in words is "twenty-one million, three hundred fifty-three thousand, eighty-six".