21240614 has 4 divisors (see below), whose sum is σ = 31860924. Its totient is φ = 10620306.

The previous prime is 21240587. The next prime is 21240631. The reversal of 21240614 is 41604212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310152 + ... + 5310155.

It is an arithmetic number, because the mean of its divisors is an integer number (7965231).

Almost surely, 2^21240614 is an apocalyptic number.

21240614 is a deficient number, since it is larger than the sum of its proper divisors (10620310).

21240614 is a wasteful number, since it uses less digits than its factorization.

21240614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620309.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21240614 is about 4608.7540615659. The cubic root of 21240614 is about 276.9421262576.

Adding to 21240614 its reverse (41604212), we get a palindrome (62844826).

It can be divided in two parts, 212 and 40614, that multiplied together give a palindrome (8610168).

The spelling of 21240614 in words is "twenty-one million, two hundred forty thousand, six hundred fourteen".