20212221101022 has 24 divisors (see below), whose sum is σ = 44511066142920. Its totient is φ = 6626957737680.

The previous prime is 20212221100993. The next prime is 20212221101047. The reversal of 20212221101022 is 22010112221202.

It is a happy number.

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 = 20212221100986 and 20212221101004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9204106872 + ... + 9204109067.

It is an arithmetic number, because the mean of its divisors is an integer number (1854627755955).

Almost surely, 2^{20212221101022} is an apocalyptic number.

20212221101022 is an abundant number, since it is smaller than the sum of its proper divisors (24298845041898).

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

20212221101022 is a wasteful number, since it uses less digits than its factorization.

20212221101022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18408216008 (or 18408216005 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20212221101022 its reverse (22010112221202), we get a palindrome (42222333322224).

The spelling of 20212221101022 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, twenty-two".