2021001001220 has 12 divisors (see below), whose sum is σ = 4244102102604. Its totient is φ = 808400400480.

The previous prime is 2021001001219. The next prime is 2021001001259. The reversal of 2021001001220 is 221001001202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1548869855296 + 472131145924 = 1244536^2 + 687118^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50525025011 + ... + 50525025050.

It is an arithmetic number, because the mean of its divisors is an integer number (353675175217).

Almost surely, 2^{2021001001220} is an apocalyptic number.

2021001001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021001001220 is an abundant number, since it is smaller than the sum of its proper divisors (2223101101384).

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

2021001001220 is a wasteful number, since it uses less digits than its factorization.

2021001001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101050050070 (or 101050050068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2021001001220 its reverse (221001001202), we get a palindrome (2242002002422).

The spelling of 2021001001220 in words is "two trillion, twenty-one billion, one million, one thousand, two hundred twenty".