20211123220220 has 48 divisors (see below), whose sum is σ = 44678261308800. Its totient is φ = 7658773404480.

The previous prime is 20211123220207. The next prime is 20211123220237. The reversal of 20211123220220 is 2202232111202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20211123220192 and 20211123220201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16308851 + ... + 17504309.

It is an arithmetic number, because the mean of its divisors is an integer number (930797110600).

Almost surely, 2^{20211123220220} is an apocalyptic number.

20211123220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211123220220 is an abundant number, since it is smaller than the sum of its proper divisors (24467138088580).

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

20211123220220 is a wasteful number, since it uses less digits than its factorization.

20211123220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239978 (or 1239976 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20211123220220 its reverse (2202232111202), we get a palindrome (22413355331422).

The spelling of 20211123220220 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-three million, two hundred twenty thousand, two hundred twenty".