20211220000 has 120 divisors (see below), whose sum is σ = 50468107536. Its totient is φ = 7963296000.

The previous prime is 20211219929. The next prime is 20211220013. The reversal of 20211220000 is 2211202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1332459 + ... + 1347541.

Almost surely, 2^20211220000 is an apocalyptic number.

20211220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25234053768).

20211220000 is an abundant number, since it is smaller than the sum of its proper divisors (30256887536).

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

20211220000 is an equidigital number, since it uses as much as digits as its factorization.

20211220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15180 (or 15157 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20211220000 its reverse (2211202), we get a palindrome (20213431202).

The spelling of 20211220000 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand".