21946242 has 16 divisors (see below), whose sum is σ = 44511552. Its totient is φ = 7212240.

The previous prime is 21946241. The next prime is 21946247. The reversal of 21946242 is 24264912.

It is not an unprimeable number, because it can be changed into a prime (21946241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25333 + ... + 26184.

It is an arithmetic number, because the mean of its divisors is an integer number (2781972).

Almost surely, 2^21946242 is an apocalyptic number.

21946242 is an abundant number, since it is smaller than the sum of its proper divisors (22565310).

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

21946242 is a wasteful number, since it uses less digits than its factorization.

21946242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51593.

The product of its digits is 6912, while the sum is 30.

The square root of 21946242 is about 4684.6816327260. The cubic root of 21946242 is about 279.9755165667.

The spelling of 21946242 in words is "twenty-one million, nine hundred forty-six thousand, two hundred forty-two".