21893814 has 48 divisors (see below), whose sum is σ = 51804480. Its totient is φ = 6910920.

The previous prime is 21893813. The next prime is 21893827. The reversal of 21893814 is 41839812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8049 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (1079260).

Almost surely, 2^21893814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21893814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25902240).

21893814 is an abundant number, since it is smaller than the sum of its proper divisors (29910666).

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

21893814 is a wasteful number, since it uses less digits than its factorization.

21893814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407 (or 2395 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21893814 is about 4679.0826023912. The cubic root of 21893814 is about 279.7523916448.

The spelling of 21893814 in words is "twenty-one million, eight hundred ninety-three thousand, eight hundred fourteen".