21022331022 has 96 divisors (see below), whose sum is σ = 56817206784. Its totient is φ = 5457499200.

The previous prime is 21022331009. The next prime is 21022331023. The reversal of 21022331022 is 22013322012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022330986 and 21022331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022331023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4531288 + ... + 4535924.

It is an arithmetic number, because the mean of its divisors is an integer number (591845904).

Almost surely, 2^21022331022 is an apocalyptic number.

21022331022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022331022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28408603392).

21022331022 is an abundant number, since it is smaller than the sum of its proper divisors (35794875762).

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

21022331022 is a wasteful number, since it uses less digits than its factorization.

21022331022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7934 (or 7931 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21022331022 its reverse (22013322012), we get a palindrome (43035653034).

The spelling of 21022331022 in words is "twenty-one billion, twenty-two million, three hundred thirty-one thousand, twenty-two".