21040674 has 16 divisors (see below), whose sum is σ = 43060512. Its totient is φ = 6850368.

The previous prime is 21040673. The next prime is 21040681. The reversal of 21040674 is 47604012.

It is not an unprimeable number, because it can be changed into a prime (21040673) 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, 40519 + ... + 41034.

It is an arithmetic number, because the mean of its divisors is an integer number (2691282).

Almost surely, 2^21040674 is an apocalyptic number.

21040674 is an abundant number, since it is smaller than the sum of its proper divisors (22019838).

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

21040674 is a wasteful number, since it uses less digits than its factorization.

21040674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81601.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21040674 is about 4587.0114453749. The cubic root of 21040674 is about 276.0704241630.

Adding to 21040674 its reverse (47604012), we get a palindrome (68644686).

The spelling of 21040674 in words is "twenty-one million, forty thousand, six hundred seventy-four".