20021021322320 has 40 divisors (see below), whose sum is σ = 46550738434824. Its totient is φ = 8008087864832.

The previous prime is 20021021322287. The next prime is 20021021322329. The reversal of 20021021322320 is 2322312012002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2706867305536 + 17314154016784 = 1645256^2 + 4161028^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20021021322292 and 20021021322301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021322329) by changing a digit.

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, 2994899 + ... + 7000818.

Almost surely, 2^{20021021322320} is an apocalyptic number.

20021021322320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021021322320 is an abundant number, since it is smaller than the sum of its proper divisors (26529717112504).

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

20021021322320 is a wasteful number, since it uses less digits than its factorization.

20021021322320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020767 (or 10020761 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20021021322320 its reverse (2322312012002), we get a palindrome (22343333334322).

The spelling of 20021021322320 in words is "twenty trillion, twenty-one billion, twenty-one million, three hundred twenty-two thousand, three hundred twenty".