210001210120 has 64 divisors (see below), whose sum is σ = 538781407920. Its totient is φ = 72977793024.

The previous prime is 210001210117. The next prime is 210001210121. The reversal of 210001210120 is 21012100012.

It can be written as a sum of positive squares in 8 ways, for example, as 46741575204 + 163259634916 = 216198^2 + 404054^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 210001210097 and 210001210106.

It is not an unprimeable number, because it can be changed into a prime (210001210121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11869057 + ... + 11886736.

Almost surely, 2^210001210120 is an apocalyptic number.

210001210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001210120 is an abundant number, since it is smaller than the sum of its proper divisors (328780197800).

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

210001210120 is a wasteful number, since it uses less digits than its factorization.

210001210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23755834 (or 23755830 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210001210120 its reverse (21012100012), we get a palindrome (231013310132).

The spelling of 210001210120 in words is "two hundred ten billion, one million, two hundred ten thousand, one hundred twenty".