210001122120 has 64 divisors (see below), whose sum is σ = 630035003520. Its totient is φ = 55997487104.

The previous prime is 210001122059. The next prime is 210001122139. The reversal of 210001122120 is 21221100012.

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 = 210001122096 and 210001122105.

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, 3630949 + ... + 3688331.

It is an arithmetic number, because the mean of its divisors is an integer number (9844296930).

Almost surely, 2^210001122120 is an apocalyptic number.

210001122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001122120 is an abundant number, since it is smaller than the sum of its proper divisors (420033881400).

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

210001122120 is a wasteful number, since it uses less digits than its factorization.

210001122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87894 (or 87890 counting only the distinct ones).

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

Adding to 210001122120 its reverse (21221100012), we get a palindrome (231222222132).

The spelling of 210001122120 in words is "two hundred ten billion, one million, one hundred twenty-two thousand, one hundred twenty".