21112022022 has 64 divisors (see below), whose sum is σ = 52156038144. Its totient is φ = 5547864960.

The previous prime is 21112021943. The next prime is 21112022053. The reversal of 21112022022 is 22022021112.

It is a junction number, because it is equal to n+sod(n) for n = 21112021992 and 21112022010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81447 + ... + 221037.

It is an arithmetic number, because the mean of its divisors is an integer number (814938096).

Almost surely, 2^21112022022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112022022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26078019072).

21112022022 is an abundant number, since it is smaller than the sum of its proper divisors (31044016122).

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

21112022022 is a wasteful number, since it uses less digits than its factorization.

21112022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139893.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21112022022 its reverse (22022021112), we get a palindrome (43134043134).

The spelling of 21112022022 in words is "twenty-one billion, one hundred twelve million, twenty-two thousand, twenty-two".