210120101220 has 24 divisors (see below), whose sum is σ = 588336283584. Its totient is φ = 56032026976.

The previous prime is 210120101159. The next prime is 210120101227. The reversal of 210120101220 is 22101021012.

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 = 210120101196 and 210120101205.

It is not an unprimeable number, because it can be changed into a prime (210120101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1751000784 + ... + 1751000903.

It is an arithmetic number, because the mean of its divisors is an integer number (24514011816).

Almost surely, 2^210120101220 is an apocalyptic number.

210120101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210120101220 is an abundant number, since it is smaller than the sum of its proper divisors (378216182364).

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

210120101220 is a wasteful number, since it uses less digits than its factorization.

210120101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3502001699 (or 3502001697 counting only the distinct ones).

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

Adding to 210120101220 its reverse (22101021012), we get a palindrome (232221122232).

The spelling of 210120101220 in words is "two hundred ten billion, one hundred twenty million, one hundred one thousand, two hundred twenty".