21486386 has 8 divisors (see below), whose sum is σ = 32303664. Its totient is φ = 10718500.

The previous prime is 21486371. The next prime is 21486389. The reversal of 21486386 is 68368412.

It is a happy number.

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 (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, 11240 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (4037958).

Almost surely, 2^21486386 is an apocalyptic number.

21486386 is a deficient number, since it is larger than the sum of its proper divisors (10817278).

21486386 is a wasteful number, since it uses less digits than its factorization.

21486386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696.

The product of its digits is 55296, while the sum is 38.

The square root of 21486386 is about 4635.3409799064. The cubic root of 21486386 is about 278.0061848425.

The spelling of 21486386 in words is "twenty-one million, four hundred eighty-six thousand, three hundred eighty-six".