2021223020544 has 1920 divisors, whose sum is σ = 8124532416000. Its totient is φ = 487599243264.

The previous prime is 2021223020543. The next prime is 2021223020567. The reversal of 2021223020544 is 4450203221202.

It is a super-2 number, since 2×2021223020544² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021223020543) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 69697345522 + ... + 69697345550.

It is an arithmetic number, because the mean of its divisors is an integer number (4231527300).

Almost surely, 2^{2021223020544} is an apocalyptic number.

2021223020544 is a gapful number since it is divisible by the number (24) 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 2021223020544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4062266208000).

2021223020544 is an abundant number, since it is smaller than the sum of its proper divisors (6103309395456).

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

2021223020544 is an frugal number, since it uses more digits than its factorization.

2021223020544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 2021223020544 its reverse (4450203221202), we get a palindrome (6471426241746).

The spelling of 2021223020544 in words is "two trillion, twenty-one billion, two hundred twenty-three million, twenty thousand, five hundred forty-four".