221211221222020 has 24 divisors (see below), whose sum is σ = 468885093211584. Its totient is φ = 87657530651616.

The previous prime is 221211221222003. The next prime is 221211221222053. The reversal of 221211221222020 is 20222122112122.

It is a junction number, because it is equal to n+sod(n) for n = 221211221221982 and 221211221222000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51684862632 + ... + 51684866911.

It is an arithmetic number, because the mean of its divisors is an integer number (19536878883816).

Almost surely, 2^{221211221222020} is an apocalyptic number.

221211221222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211221222020 is an abundant number, since it is smaller than the sum of its proper divisors (247673871989564).

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

221211221222020 is a wasteful number, since it uses less digits than its factorization.

221211221222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103369729659 (or 103369729657 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221211221222020 its reverse (20222122112122), we get a palindrome (241433343334142).

The spelling of 221211221222020 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty".