21896874 has 48 divisors (see below), whose sum is σ = 49937472. Its totient is φ = 6921024.

The previous prime is 21896863. The next prime is 21896879. The reversal of 21896874 is 47869812.

It is not an unprimeable number, because it can be changed into a prime (21896879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93862 + ... + 94094.

It is an arithmetic number, because the mean of its divisors is an integer number (1040364).

Almost surely, 2^21896874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21896874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24968736).

21896874 is an abundant number, since it is smaller than the sum of its proper divisors (28040598).

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

21896874 is a wasteful number, since it uses less digits than its factorization.

21896874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 488 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 21896874 is about 4679.4095781412. The cubic root of 21896874 is about 279.7654242826.

The spelling of 21896874 in words is "twenty-one million, eight hundred ninety-six thousand, eight hundred seventy-four".