21101221022 has 16 divisors (see below), whose sum is σ = 36287641440. Its totient is φ = 9014850528.

The previous prime is 21101221021. The next prime is 21101221103. The reversal of 21101221022 is 22012210112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21101220988 and 21101221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2372897 + ... + 2381772.

It is an arithmetic number, because the mean of its divisors is an integer number (2267977590).

Almost surely, 2^21101221022 is an apocalyptic number.

21101221022 is a deficient number, since it is larger than the sum of its proper divisors (15186420418).

21101221022 is a wasteful number, since it uses less digits than its factorization.

21101221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4754995.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21101221022 its reverse (22012210112), we get a palindrome (43113431134).

The spelling of 21101221022 in words is "twenty-one billion, one hundred one million, two hundred twenty-one thousand, twenty-two".