20211210120 has 128 divisors (see below), whose sum is σ = 64748160000. Its totient is φ = 5035914240.

The previous prime is 20211210113. The next prime is 20211210139. The reversal of 20211210120 is 2101211202.

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

It is a junction number, because it is equal to n+sod(n) for n = 20211210096 and 20211210105.

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 31 ways as a sum of consecutive naturals, for example, 14206 + ... + 201554.

It is an arithmetic number, because the mean of its divisors is an integer number (505845000).

Almost surely, 2^20211210120 is an apocalyptic number.

20211210120 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 20211210120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32374080000).

20211210120 is an abundant number, since it is smaller than the sum of its proper divisors (44536949880).

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

20211210120 is a wasteful number, since it uses less digits than its factorization.

20211210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187423 (or 187419 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20211210120 its reverse (2101211202), we get a palindrome (22312421322).

The spelling of 20211210120 in words is "twenty billion, two hundred eleven million, two hundred ten thousand, one hundred twenty".