201021221220 has 48 divisors (see below), whose sum is σ = 574835159808. Its totient is φ = 52465112320.

The previous prime is 201021221179. The next prime is 201021221239. The reversal of 201021221220 is 22122120102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 201021221220.

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, 35639241 + ... + 35644880.

It is an arithmetic number, because the mean of its divisors is an integer number (11975732496).

Almost surely, 2^201021221220 is an apocalyptic number.

201021221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021221220 is an abundant number, since it is smaller than the sum of its proper divisors (373813938588).

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

201021221220 is a wasteful number, since it uses less digits than its factorization.

201021221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71284180 (or 71284178 counting only the distinct ones).

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

Adding to 201021221220 its reverse (22122120102), we get a palindrome (223143341322).

The spelling of 201021221220 in words is "two hundred one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".