21100022 has 16 divisors (see below), whose sum is σ = 32518752. Its totient is φ = 10264320.

The previous prime is 21100021. The next prime is 21100033. The reversal of 21100022 is 22000112.

It is a junction number, because it is equal to n+sod(n) for n = 21099982 and 21100009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100021) 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, 10943 + ... + 12725.

It is an arithmetic number, because the mean of its divisors is an integer number (2032422).

Almost surely, 2^21100022 is an apocalyptic number.

21100022 is a deficient number, since it is larger than the sum of its proper divisors (11418730).

21100022 is a wasteful number, since it uses less digits than its factorization.

21100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21100022 is about 4593.4760258436. The cubic root of 21100022 is about 276.3297448642.

Adding to 21100022 its reverse (22000112), we get a palindrome (43100134).

The spelling of 21100022 in words is "twenty-one million, one hundred thousand, twenty-two".