21022120111000 has 128 divisors (see below), whose sum is σ = 49441094876160. Its totient is φ = 8366253168000.

The previous prime is 21022120110923. The next prime is 21022120111009. The reversal of 21022120111000 is 11102122012.

It is a super-2 number, since 2×21022120111000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022120111009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 718862379 + ... + 718891621.

It is an arithmetic number, because the mean of its divisors is an integer number (386258553720).

Almost surely, 2^{21022120111000} is an apocalyptic number.

21022120111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022120111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24720547438080).

21022120111000 is an abundant number, since it is smaller than the sum of its proper divisors (28418974765160).

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

21022120111000 is a wasteful number, since it uses less digits than its factorization.

21022120111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32882 (or 32868 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21022120111000 its reverse (11102122012), we get a palindrome (21033222233012).

The spelling of 21022120111000 in words is "twenty-one trillion, twenty-two billion, one hundred twenty million, one hundred eleven thousand".