20231221213320 has 64 divisors (see below), whose sum is σ = 65362407001920. Its totient is φ = 4979992913664.

The previous prime is 20231221213267. The next prime is 20231221213321. The reversal of 20231221213320 is 2331212213202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20231221213321) 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 15 ways as a sum of consecutive naturals, for example, 6484364214 + ... + 6484367333.

It is an arithmetic number, because the mean of its divisors is an integer number (1021287609405).

Almost surely, 2^{20231221213320} is an apocalyptic number.

20231221213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20231221213320 is an abundant number, since it is smaller than the sum of its proper divisors (45131185788600).

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

20231221213320 is a wasteful number, since it uses less digits than its factorization.

20231221213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12968731574 (or 12968731570 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20231221213320 its reverse (2331212213202), we get a palindrome (22562433426522).

The spelling of 20231221213320 in words is "twenty trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred twenty".