210121001010 has 24 divisors (see below), whose sum is σ = 546314602860. Its totient is φ = 56032266912.

The previous prime is 210121000987. The next prime is 210121001033. The reversal of 210121001010 is 10100121012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (210121000987) and next prime (210121001033).

It can be written as a sum of positive squares in 2 ways, for example, as 203016028329 + 7104972681 = 450573^2 + 84291^2 .

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 = 210121000983 and 210121001001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1167338805 + ... + 1167338984.

Almost surely, 2^210121001010 is an apocalyptic number.

210121001010 is an abundant number, since it is smaller than the sum of its proper divisors (336193601850).

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

210121001010 is a wasteful number, since it uses less digits than its factorization.

210121001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334677802 (or 2334677799 counting only the distinct ones).

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

Adding to 210121001010 its reverse (10100121012), we get a palindrome (220221122022).

The spelling of 210121001010 in words is "two hundred ten billion, one hundred twenty-one million, one thousand, ten".