20112312001221 has 96 divisors (see below), whose sum is σ = 33000588985728. Its totient is φ = 11696039608320.

The previous prime is 20112312001219. The next prime is 20112312001241. The reversal of 20112312001221 is 12210021321102.

20112312001221 is a `hidden beast` number, since 2 + 0 + 11 + 231 + 200 + 1 + 221 = 666.

It is not a de Polignac number, because 20112312001221 - 2¹ = 20112312001219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112312001194 and 20112312001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112312001241) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 100453005 + ... + 100653021.

It is an arithmetic number, because the mean of its divisors is an integer number (343756135268).

Almost surely, 2^{20112312001221} is an apocalyptic number.

It is an amenable number.

20112312001221 is a deficient number, since it is larger than the sum of its proper divisors (12888276984507).

20112312001221 is a wasteful number, since it uses less digits than its factorization.

20112312001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200451 (or 200448 counting only the distinct ones).

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

Adding to 20112312001221 its reverse (12210021321102), we get a palindrome (32322333322323).

The spelling of 20112312001221 in words is "twenty trillion, one hundred twelve billion, three hundred twelve million, one thousand, two hundred twenty-one".