21941838 has 12 divisors (see below), whose sum is σ = 47540688. Its totient is φ = 7313940.

The previous prime is 21941837. The next prime is 21941863. The reversal of 21941838 is 83814912.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609478 + ... + 609513.

It is an arithmetic number, because the mean of its divisors is an integer number (3961724).

Almost surely, 2^21941838 is an apocalyptic number.

21941838 is an abundant number, since it is smaller than the sum of its proper divisors (25598850).

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

21941838 is a wasteful number, since it uses less digits than its factorization.

21941838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218999 (or 1218996 counting only the distinct ones).

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

The square root of 21941838 is about 4684.2115665286. The cubic root of 21941838 is about 279.9567875490.

The spelling of 21941838 in words is "twenty-one million, nine hundred forty-one thousand, eight hundred thirty-eight".