21424486 has 4 divisors (see below), whose sum is σ = 32136732. Its totient is φ = 10712242.

The previous prime is 21424451. The next prime is 21424489. The reversal of 21424486 is 68442412.

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 (21424489) 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 as a sum of consecutive naturals, namely, 5356120 + ... + 5356123.

It is an arithmetic number, because the mean of its divisors is an integer number (8034183).

Almost surely, 2^21424486 is an apocalyptic number.

21424486 is a deficient number, since it is larger than the sum of its proper divisors (10712246).

21424486 is a wasteful number, since it uses less digits than its factorization.

21424486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712245.

The product of its digits is 12288, while the sum is 31.

The square root of 21424486 is about 4628.6592011078. The cubic root of 21424486 is about 277.7389592807.

Adding to 21424486 its reverse (68442412), we get a palindrome (89866898).

The spelling of 21424486 in words is "twenty-one million, four hundred twenty-four thousand, four hundred eighty-six".