21293486 has 16 divisors (see below), whose sum is σ = 33953904. Its totient is φ = 9980544.

The previous prime is 21293483. The next prime is 21293521. The reversal of 21293486 is 68439212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8516 + ... + 10728.

It is an arithmetic number, because the mean of its divisors is an integer number (2122119).

Almost surely, 2^21293486 is an apocalyptic number.

21293486 is a deficient number, since it is larger than the sum of its proper divisors (12660418).

21293486 is a wasteful number, since it uses less digits than its factorization.

21293486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515.

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

The square root of 21293486 is about 4614.4865369833. The cubic root of 21293486 is about 277.1717233799.

The spelling of 21293486 in words is "twenty-one million, two hundred ninety-three thousand, four hundred eighty-six".