21940074 has 24 divisors (see below), whose sum is σ = 51194052. Its totient is φ = 6750720.

The previous prime is 21940073. The next prime is 21940099. The reversal of 21940074 is 47004912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17766225 + 4173849 = 4215^2 + 2043^2 .

It is not an unprimeable number, because it can be changed into a prime (21940073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46647 + ... + 47114.

Almost surely, 2^21940074 is an apocalyptic number.

21940074 is an abundant number, since it is smaller than the sum of its proper divisors (29253978).

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

21940074 is a wasteful number, since it uses less digits than its factorization.

21940074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93782 (or 93779 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21940074 is about 4684.0232706510. The cubic root of 21940074 is about 279.9492850325.

Adding to 21940074 its reverse (47004912), we get a palindrome (68944986).

The spelling of 21940074 in words is "twenty-one million, nine hundred forty thousand, seventy-four".