20211021121220 has 48 divisors (see below), whose sum is σ = 43077914510400. Its totient is φ = 7963507077504.

The previous prime is 20211021121157. The next prime is 20211021121241. The reversal of 20211021121220 is 2212112011202.

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, 48432902 + ... + 48848418.

It is an arithmetic number, because the mean of its divisors is an integer number (897456552300).

Almost surely, 2^{20211021121220} is an apocalyptic number.

20211021121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211021121220 is an abundant number, since it is smaller than the sum of its proper divisors (22866893389180).

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

20211021121220 is a wasteful number, since it uses less digits than its factorization.

20211021121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451892 (or 451890 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211021121220 its reverse (2212112011202), we get a palindrome (22423133132422).

The spelling of 20211021121220 in words is "twenty trillion, two hundred eleven billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".