20221221321 has 32 divisors (see below), whose sum is σ = 34264800000. Its totient is φ = 11545597440.

The previous prime is 20221221301. The next prime is 20221221329. The reversal of 20221221321 is 12312212202.

It is not a de Polignac number, because 20221221321 - 2¹⁰ = 20221220297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221221294 and 20221221303.

It is not an unprimeable number, because it can be changed into a prime (20221221329) 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, 193231 + ... + 278891.

It is an arithmetic number, because the mean of its divisors is an integer number (1070775000).

Almost surely, 2^20221221321 is an apocalyptic number.

20221221321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20221221321 is a deficient number, since it is larger than the sum of its proper divisors (14043578679).

20221221321 is a wasteful number, since it uses less digits than its factorization.

20221221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86926 (or 86920 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20221221321 its reverse (12312212202), we get a palindrome (32533433523).

The spelling of 20221221321 in words is "twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".