21013414 has 4 divisors (see below), whose sum is σ = 31520124. Its totient is φ = 10506706.

The previous prime is 21013397. The next prime is 21013417. The reversal of 21013414 is 41431012.

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 (21013417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253352 + ... + 5253355.

It is an arithmetic number, because the mean of its divisors is an integer number (7880031).

Almost surely, 2^21013414 is an apocalyptic number.

21013414 is a deficient number, since it is larger than the sum of its proper divisors (10506710).

21013414 is a wasteful number, since it uses less digits than its factorization.

21013414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506709.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21013414 is about 4584.0390486993. The cubic root of 21013414 is about 275.9511483236.

Adding to 21013414 its reverse (41431012), we get a palindrome (62444426).

The spelling of 21013414 in words is "twenty-one million, thirteen thousand, four hundred fourteen".