21111222011022 has 144 divisors (see below), whose sum is σ = 54479481363216. Its totient is φ = 5905235793600.

The previous prime is 21111222011003. The next prime is 21111222011027. The reversal of 21111222011022 is 22011022211112.

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 = 21111222010986 and 21111222011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111222011027) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1441872 + ... + 6655932.

It is an arithmetic number, because the mean of its divisors is an integer number (378329731689).

Almost surely, 2^{21111222011022} is an apocalyptic number.

21111222011022 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 21111222011022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27239740681608).

21111222011022 is an abundant number, since it is smaller than the sum of its proper divisors (33368259352194).

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

21111222011022 is a wasteful number, since it uses less digits than its factorization.

21111222011022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214128 (or 5214090 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111222011022 its reverse (22011022211112), we get a palindrome (43122244222134).

The spelling of 21111222011022 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, eleven thousand, twenty-two".