21606414 has 16 divisors (see below), whose sum is σ = 43355520. Its totient is φ = 7178360.

The previous prime is 21606359. The next prime is 21606419. The reversal of 21606414 is 41460612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606419) 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, 3924 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (2709720).

Almost surely, 2^21606414 is an apocalyptic number.

21606414 is an abundant number, since it is smaller than the sum of its proper divisors (21749106).

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

21606414 is a wasteful number, since it uses less digits than its factorization.

21606414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11895.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21606414 is about 4648.2700007637. The cubic root of 21606414 is about 278.5228931691.

The spelling of 21606414 in words is "twenty-one million, six hundred six thousand, four hundred fourteen".