21240014 has 4 divisors (see below), whose sum is σ = 31860024. Its totient is φ = 10620006.

The previous prime is 21240001. The next prime is 21240049. The reversal of 21240014 is 41004212.

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

It is a super-2 number, since 2×21240014² = 902276389440392, which contains 22 as substring.

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, 5310002 + ... + 5310005.

It is an arithmetic number, because the mean of its divisors is an integer number (7965006).

Almost surely, 2^21240014 is an apocalyptic number.

21240014 is a deficient number, since it is larger than the sum of its proper divisors (10620010).

21240014 is a wasteful number, since it uses less digits than its factorization.

21240014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620009.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21240014 is about 4608.6889675915. The cubic root of 21240014 is about 276.9395185672.

Adding to 21240014 its reverse (41004212), we get a palindrome (62244226).

The spelling of 21240014 in words is "twenty-one million, two hundred forty thousand, fourteen".