21040422 has 16 divisors (see below), whose sum is σ = 45318000. Its totient is φ = 6473952.

The previous prime is 21040387. The next prime is 21040427. The reversal of 21040422 is 22404012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040427) 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, 134797 + ... + 134952.

It is an arithmetic number, because the mean of its divisors is an integer number (2832375).

Almost surely, 2^21040422 is an apocalyptic number.

21040422 is an abundant number, since it is smaller than the sum of its proper divisors (24277578).

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

21040422 is a wasteful number, since it uses less digits than its factorization.

21040422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269767.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 21040422 is about 4586.9839764272. The cubic root of 21040422 is about 276.0693220117.

Adding to 21040422 its reverse (22404012), we get a palindrome (43444434).

The spelling of 21040422 in words is "twenty-one million, forty thousand, four hundred twenty-two".