21020021202222 has 128 divisors (see below), whose sum is σ = 57626102937600. Its totient is φ = 5546512274688.

The previous prime is 21020021202181. The next prime is 21020021202223. The reversal of 21020021202222 is 22220212002012.

21020021202222 is a `hidden beast` number, since 21 + 0 + 200 + 21 + 202 + 222 = 666.

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 = 21020021202195 and 21020021202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020021202223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41433423 + ... + 41937674.

It is an arithmetic number, because the mean of its divisors is an integer number (450203929200).

Almost surely, 2^{21020021202222} is an apocalyptic number.

21020021202222 is an abundant number, since it is smaller than the sum of its proper divisors (36606081735378).

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

21020021202222 is a wasteful number, since it uses less digits than its factorization.

21020021202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83371167 (or 83371161 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21020021202222 its reverse (22220212002012), we get a palindrome (43240233204234).

The spelling of 21020021202222 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred two thousand, two hundred twenty-two".