21486367 has 4 divisors (see below), whose sum is σ = 24555856. Its totient is φ = 18416880.

The previous prime is 21486331. The next prime is 21486371. The reversal of 21486367 is 76368412.

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

It is a cyclic number.

It is not a de Polignac number, because 21486367 - 2⁷ = 21486239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486067) 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, 1534734 + ... + 1534747.

It is an arithmetic number, because the mean of its divisors is an integer number (6138964).

Almost surely, 2^21486367 is an apocalyptic number.

21486367 is a deficient number, since it is larger than the sum of its proper divisors (3069489).

21486367 is an equidigital number, since it uses as much as digits as its factorization.

21486367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069488.

The product of its digits is 48384, while the sum is 37.

The square root of 21486367 is about 4635.3389304343. The cubic root of 21486367 is about 278.0061028973.

It can be divided in two parts, 2148 and 6367, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 21486367 in words is "twenty-one million, four hundred eighty-six thousand, three hundred sixty-seven".