20321212110021 has 24 divisors (see below), whose sum is σ = 30351346631424. Its totient is φ = 13088124636480.

The previous prime is 20321212110013. The next prime is 20321212110047. The reversal of 20321212110021 is 12001121212302.

20321212110021 is a `hidden beast` number, since 2 + 0 + 321 + 212 + 110 + 0 + 21 = 666.

It is not a de Polignac number, because 20321212110021 - 2³ = 20321212110013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321212109976 and 20321212110003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321212110011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61877016 + ... + 62204561.

It is an arithmetic number, because the mean of its divisors is an integer number (1264639442976).

Almost surely, 2^{20321212110021} is an apocalyptic number.

It is an amenable number.

20321212110021 is a deficient number, since it is larger than the sum of its proper divisors (10030134521403).

20321212110021 is a wasteful number, since it uses less digits than its factorization.

20321212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124082201 (or 124082198 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20321212110021 its reverse (12001121212302), we get a palindrome (32322333322323).

The spelling of 20321212110021 in words is "twenty trillion, three hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, twenty-one".