201121222020 has 96 divisors (see below), whose sum is σ = 569207106048. Its totient is φ = 53054963712.

The previous prime is 201121222007. The next prime is 201121222069. The reversal of 201121222020 is 20222121102.

201121222020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15084597 + ... + 15097923.

It is an arithmetic number, because the mean of its divisors is an integer number (5929240688).

Almost surely, 2^201121222020 is an apocalyptic number.

201121222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201121222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284603553024).

201121222020 is an abundant number, since it is smaller than the sum of its proper divisors (368085884028).

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

201121222020 is a wasteful number, since it uses less digits than its factorization.

201121222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16029 (or 16027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 201121222020 its reverse (20222121102), we get a palindrome (221343343122).

The spelling of 201121222020 in words is "two hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".