21413838 has 8 divisors (see below), whose sum is σ = 42827688. Its totient is φ = 7137944.

The previous prime is 21413837. The next prime is 21413857. The reversal of 21413838 is 83831412.

It is a sphenic number, since it is the product of 3 distinct primes.

21413838 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784481 + ... + 1784492.

It is an arithmetic number, because the mean of its divisors is an integer number (5353461).

Almost surely, 2^21413838 is an apocalyptic number.

21413838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21413838 is a wasteful number, since it uses less digits than its factorization.

21413838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568978.

The product of its digits is 4608, while the sum is 30.

The square root of 21413838 is about 4627.5088330548. The cubic root of 21413838 is about 277.6929394367.

The spelling of 21413838 in words is "twenty-one million, four hundred thirteen thousand, eight hundred thirty-eight".