210121002 has 96 divisors (see below), whose sum is σ = 575632512. Its totient is φ = 53903232.

The previous prime is 210121001. The next prime is 210121063. The reversal of 210121002 is 200121012.

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

It is not an unprimeable number, because it can be changed into a prime (210121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58873 + ... + 62339.

It is an arithmetic number, because the mean of its divisors is an integer number (5996172).

Almost surely, 2^210121002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210121002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287816256).

210121002 is an abundant number, since it is smaller than the sum of its proper divisors (365511510).

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

210121002 is a wasteful number, since it uses less digits than its factorization.

210121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532 (or 3529 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210121002 is about 14495.5511105994. The cubic root of 210121002 is about 594.5063362841.

Adding to 210121002 its reverse (200121012), we get a palindrome (410242014).

The spelling of 210121002 in words is "two hundred ten million, one hundred twenty-one thousand, two".