21010422 has 16 divisors (see below), whose sum is σ = 42597360. Its totient is φ = 6907392.

The previous prime is 21010411. The next prime is 21010427. The reversal of 21010422 is 22401012.

It is a junction number, because it is equal to n+sod(n) for n = 21010398 and 21010407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23547 + ... + 24422.

It is an arithmetic number, because the mean of its divisors is an integer number (2662335).

Almost surely, 2^21010422 is an apocalyptic number.

21010422 is an abundant number, since it is smaller than the sum of its proper divisors (21586938).

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

21010422 is a wasteful number, since it uses less digits than its factorization.

21010422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48047.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21010422 is about 4583.7126873311. The cubic root of 21010422 is about 275.9380505785.

Adding to 21010422 its reverse (22401012), we get a palindrome (43411434).

The spelling of 21010422 in words is "twenty-one million, ten thousand, four hundred twenty-two".