210121320 has 32 divisors (see below), whose sum is σ = 630364320. Its totient is φ = 56032320.

The previous prime is 210121297. The next prime is 210121321. The reversal of 210121320 is 23121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210121296 and 210121305.

It is not an unprimeable number, because it can be changed into a prime (210121321) 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 7 ways as a sum of consecutive naturals, for example, 875386 + ... + 875625.

It is an arithmetic number, because the mean of its divisors is an integer number (19698885).

Almost surely, 2^210121320 is an apocalyptic number.

210121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121320 is an abundant number, since it is smaller than the sum of its proper divisors (420243000).

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

210121320 is a wasteful number, since it uses less digits than its factorization.

210121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751025 (or 1751021 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 210121320 is about 14495.5620794780. The cubic root of 210121320 is about 594.5066361953.

Adding to 210121320 its reverse (23121012), we get a palindrome (233242332).

The spelling of 210121320 in words is "two hundred ten million, one hundred twenty-one thousand, three hundred twenty".