210021010120 has 16 divisors (see below), whose sum is σ = 472547272860. Its totient is φ = 84008404032.

The previous prime is 210021010117. The next prime is 210021010127. The reversal of 210021010120 is 21010120012.

It can be written as a sum of positive squares in 2 ways, for example, as 207886754916 + 2134255204 = 455946^2 + 46198^2 .

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 = 210021010097 and 210021010106.

It is not an unprimeable number, because it can be changed into a prime (210021010127) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2625262587 + ... + 2625262666.

Almost surely, 2^210021010120 is an apocalyptic number.

210021010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021010120 is an abundant number, since it is smaller than the sum of its proper divisors (262526262740).

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

210021010120 is a wasteful number, since it uses less digits than its factorization.

210021010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250525264 (or 5250525260 counting only the distinct ones).

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

Adding to 210021010120 its reverse (21010120012), we get a palindrome (231031130132).

The spelling of 210021010120 in words is "two hundred ten billion, twenty-one million, ten thousand, one hundred twenty".