20321213001021 has 48 divisors (see below), whose sum is σ = 30139915029120. Its totient is φ = 13188913637760.

The previous prime is 20321213000987. The next prime is 20321213001071. The reversal of 20321213001021 is 12010031212302.

20321213001021 is a `hidden beast` number, since 2 + 0 + 321 + 21 + 300 + 1 + 0 + 21 = 666.

It is not a de Polignac number, because 20321213001021 - 2¹⁵ = 20321212968253 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20321213000985 and 20321213001003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321213001071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106042990 + ... + 106234448.

It is an arithmetic number, because the mean of its divisors is an integer number (627914896440).

Almost surely, 2^{20321213001021} is an apocalyptic number.

It is an amenable number.

20321213001021 is a deficient number, since it is larger than the sum of its proper divisors (9818702028099).

20321213001021 is a wasteful number, since it uses less digits than its factorization.

20321213001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193506 (or 193503 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20321213001021 its reverse (12010031212302), we get a palindrome (32331244213323).

The spelling of 20321213001021 in words is "twenty trillion, three hundred twenty-one billion, two hundred thirteen million, one thousand, twenty-one".