21045414 has 32 divisors (see below), whose sum is σ = 47303424. Its totient is φ = 6193440.

The previous prime is 21045377. The next prime is 21045421. The reversal of 21045414 is 41454012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4072 + ... + 7659.

It is an arithmetic number, because the mean of its divisors is an integer number (1478232).

Almost surely, 2^21045414 is an apocalyptic number.

21045414 is an abundant number, since it is smaller than the sum of its proper divisors (26258010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21045414 is a wasteful number, since it uses less digits than its factorization.

21045414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11772.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 21045414 is about 4587.5280925570. The cubic root of 21045414 is about 276.0911534667.

Adding to 21045414 its reverse (41454012), we get a palindrome (62499426).

The spelling of 21045414 in words is "twenty-one million, forty-five thousand, four hundred fourteen".