20444003331021 has 12 divisors (see below), whose sum is σ = 29531292045372. Its totient is φ = 13628844010176.

The previous prime is 20444003331013. The next prime is 20444003331049. The reversal of 20444003331021 is 12013330044402.

20444003331021 is a `hidden beast` number, since 204 + 4 + 400 + 3 + 3 + 31 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18762637275396 + 1681366055625 = 4331586^2 + 1296675^2 .

It is not a de Polignac number, because 20444003331021 - 2³ = 20444003331013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444003331421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40698486 + ... + 41197751.

It is an arithmetic number, because the mean of its divisors is an integer number (2460941003781).

Almost surely, 2^{20444003331021} is an apocalyptic number.

It is an amenable number.

20444003331021 is a deficient number, since it is larger than the sum of its proper divisors (9087288714351).

20444003331021 is a wasteful number, since it uses less digits than its factorization.

20444003331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81923980 (or 81923977 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 20444003331021 its reverse (12013330044402), we get a palindrome (32457333375423).

The spelling of 20444003331021 in words is "twenty trillion, four hundred forty-four billion, three million, three hundred thirty-one thousand, twenty-one".