20221221000 has 64 divisors (see below), whose sum is σ = 63090218880. Its totient is φ = 5392324800.

The previous prime is 20221220989. The next prime is 20221221049. The reversal of 20221221000 is 12212202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3367204 + ... + 3373203.

It is an arithmetic number, because the mean of its divisors is an integer number (985784670).

Almost surely, 2^20221221000 is an apocalyptic number.

20221221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221221000 is an abundant number, since it is smaller than the sum of its proper divisors (42868997880).

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

20221221000 is a wasteful number, since it uses less digits than its factorization.

20221221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740431 (or 6740417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20221221000 its reverse (12212202), we get a palindrome (20233433202).

The spelling of 20221221000 in words is "twenty billion, two hundred twenty-one million, two hundred twenty-one thousand".