21100422 has 32 divisors (see below), whose sum is σ = 48478464. Its totient is φ = 5997600.

The previous prime is 21100411. The next prime is 21100423. The reversal of 21100422 is 22400112.

It is a junction number, because it is equal to n+sod(n) for n = 21100398 and 21100407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100423) 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 15 ways as a sum of consecutive naturals, for example, 7672 + ... + 10052.

It is an arithmetic number, because the mean of its divisors is an integer number (1514952).

Almost surely, 2^21100422 is an apocalyptic number.

21100422 is an abundant number, since it is smaller than the sum of its proper divisors (27378042).

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

21100422 is a wasteful number, since it uses less digits than its factorization.

21100422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604.

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

The square root of 21100422 is about 4593.5195656490. The cubic root of 21100422 is about 276.3314910108.

Adding to 21100422 its reverse (22400112), we get a palindrome (43500534).

The spelling of 21100422 in words is "twenty-one million, one hundred thousand, four hundred twenty-two".