2021101221020 has 24 divisors (see below), whose sum is σ = 4850642930784. Its totient is φ = 692948990016.

The previous prime is 2021101221001. The next prime is 2021101221067. The reversal of 2021101221020 is 201221011202.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2021101220986 and 2021101221004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7218218507 + ... + 7218218786.

It is an arithmetic number, because the mean of its divisors is an integer number (202110122116).

Almost surely, 2^{2021101221020} is an apocalyptic number.

2021101221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021101221020 is an abundant number, since it is smaller than the sum of its proper divisors (2829541709764).

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

2021101221020 is a wasteful number, since it uses less digits than its factorization.

2021101221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436437309 (or 14436437307 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021101221020 its reverse (201221011202), we get a palindrome (2222322232222).

The spelling of 2021101221020 in words is "two trillion, twenty-one billion, one hundred one million, two hundred twenty-one thousand, twenty".