21486329 has 4 divisors (see below), whose sum is σ = 21605220. Its totient is φ = 21367440.

The previous prime is 21486313. The next prime is 21486331. The reversal of 21486329 is 92368412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1817104 + 19669225 = 1348^2 + 4435^2 .

It is a cyclic number.

It is not a de Polignac number, because 21486329 - 2⁴ = 21486313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21486389) 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, 59174 + ... + 59535.

It is an arithmetic number, because the mean of its divisors is an integer number (5401305).

Almost surely, 2^21486329 is an apocalyptic number.

It is an amenable number.

21486329 is a deficient number, since it is larger than the sum of its proper divisors (118891).

21486329 is a wasteful number, since it uses less digits than its factorization.

21486329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118890.

The product of its digits is 20736, while the sum is 35.

The square root of 21486329 is about 4635.3348314874. The cubic root of 21486329 is about 278.0059390067.

The spelling of 21486329 in words is "twenty-one million, four hundred eighty-six thousand, three hundred twenty-nine".