21803442 has 8 divisors (see below), whose sum is σ = 43606896. Its totient is φ = 7267812.

The previous prime is 21803437. The next prime is 21803443. The reversal of 21803442 is 24430812.

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

21803442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21803443) 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, 1816948 + ... + 1816959.

It is an arithmetic number, because the mean of its divisors is an integer number (5450862).

Almost surely, 2^21803442 is an apocalyptic number.

21803442 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.

21803442 is a wasteful number, since it uses less digits than its factorization.

21803442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633912.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21803442 is about 4669.4155951254. The cubic root of 21803442 is about 279.3669456511.

The spelling of 21803442 in words is "twenty-one million, eight hundred three thousand, four hundred forty-two".