210121210220 has 12 divisors (see below), whose sum is σ = 441254541504. Its totient is φ = 84048484080.

The previous prime is 210121210151. The next prime is 210121210223. The reversal of 210121210220 is 22012121012.

210121210220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 210121210195 and 210121210204.

It is not an unprimeable number, because it can be changed into a prime (210121210223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5253030236 + ... + 5253030275.

It is an arithmetic number, because the mean of its divisors is an integer number (36771211792).

Almost surely, 2^210121210220 is an apocalyptic number.

210121210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121210220 is an abundant number, since it is smaller than the sum of its proper divisors (231133331284).

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

210121210220 is a wasteful number, since it uses less digits than its factorization.

210121210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506060520 (or 10506060518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210121210220 its reverse (22012121012), we get a palindrome (232133331232).

The spelling of 210121210220 in words is "two hundred ten billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".