210121110220 has 48 divisors (see below), whose sum is σ = 506455080768. Its totient is φ = 71732321280.

The previous prime is 210121110209. The next prime is 210121110233. The reversal of 210121110220 is 22011121012.

It is a super-3 number, since 3×210121110220³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210121110220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3188121 + ... + 3253360.

It is an arithmetic number, because the mean of its divisors is an integer number (10551147516).

Almost surely, 2^210121110220 is an apocalyptic number.

210121110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121110220 is an abundant number, since it is smaller than the sum of its proper divisors (296333970548).

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

210121110220 is a wasteful number, since it uses less digits than its factorization.

210121110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441730 (or 6441728 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210121110220 its reverse (22011121012), we get a palindrome (232132231232).

The spelling of 210121110220 in words is "two hundred ten billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty".