20201213203221 has 32 divisors (see below), whose sum is σ = 28987713381888. Its totient is φ = 12467125693440.

The previous prime is 20201213203207. The next prime is 20201213203243. The reversal of 20201213203221 is 12230231210202.

It is a de Polignac number, because none of the positive numbers 2^k-20201213203221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201213203201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147414691 + ... + 147551663.

It is an arithmetic number, because the mean of its divisors is an integer number (905866043184).

Almost surely, 2^{20201213203221} is an apocalyptic number.

It is an amenable number.

20201213203221 is a deficient number, since it is larger than the sum of its proper divisors (8786500178667).

20201213203221 is a wasteful number, since it uses less digits than its factorization.

20201213203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184461.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20201213203221 its reverse (12230231210202), we get a palindrome (32431444413423).

The spelling of 20201213203221 in words is "twenty trillion, two hundred one billion, two hundred thirteen million, two hundred three thousand, two hundred twenty-one".