2021101220020 has 24 divisors (see below), whose sum is σ = 4493978007624. Its totient is φ = 760885165056.

The previous prime is 2021101219997. The next prime is 2021101220053. The reversal of 2021101220020 is 200221011202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 245672887716 + 1775428332304 = 495654^2 + 1332452^2 .

It is a congruent number.

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, 2972207337 + ... + 2972208016.

It is an arithmetic number, because the mean of its divisors is an integer number (187249083651).

Almost surely, 2^{2021101220020} is an apocalyptic number.

2021101220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021101220020 is an abundant number, since it is smaller than the sum of its proper divisors (2472876787604).

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

2021101220020 is a wasteful number, since it uses less digits than its factorization.

2021101220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5944415379 (or 5944415377 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021101220020 its reverse (200221011202), we get a palindrome (2221322231222).

The spelling of 2021101220020 in words is "two trillion, twenty-one billion, one hundred one million, two hundred twenty thousand, twenty".