210121010010 has 32 divisors (see below), whose sum is σ = 560322694080. Its totient is φ = 56032269264.

The previous prime is 210121009951. The next prime is 210121010017. The reversal of 210121010010 is 10010121012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210121009974 and 210121010001.

It is not an unprimeable number, because it can be changed into a prime (210121010017) 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 15 ways as a sum of consecutive naturals, for example, 389112712 + ... + 389113251.

It is an arithmetic number, because the mean of its divisors is an integer number (17510084190).

Almost surely, 2^210121010010 is an apocalyptic number.

210121010010 is an abundant number, since it is smaller than the sum of its proper divisors (350201684070).

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

210121010010 is a wasteful number, since it uses less digits than its factorization.

210121010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778225979 (or 778225973 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210121010010 its reverse (10010121012), we get a palindrome (220131131022).

The spelling of 210121010010 in words is "two hundred ten billion, one hundred twenty-one million, ten thousand, ten".