21020414 has 16 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 10297560.

The previous prime is 21020411. The next prime is 21020429. The reversal of 21020414 is 41402012.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22619 + ... + 23529.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^21020414 is an apocalyptic number.

21020414 is a deficient number, since it is larger than the sum of its proper divisors (11154946).

21020414 is a wasteful number, since it uses less digits than its factorization.

21020414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135.

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

The square root of 21020414 is about 4584.8025039253. The cubic root of 21020414 is about 275.9817865878.

Adding to 21020414 its reverse (41402012), we get a palindrome (62422426).

The spelling of 21020414 in words is "twenty-one million, twenty thousand, four hundred fourteen".