210121201220 has 216 divisors, whose sum is σ = 546738196032. Its totient is φ = 67620940800.

The previous prime is 210121201219. The next prime is 210121201253. The reversal of 210121201220 is 22102121012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 210121201195 and 210121201204.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 139060265 + ... + 139061775.

It is an arithmetic number, because the mean of its divisors is an integer number (2531195352).

Almost surely, 2^210121201220 is an apocalyptic number.

210121201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210121201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273369098016).

210121201220 is an abundant number, since it is smaller than the sum of its proper divisors (336616994812).

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

210121201220 is a wasteful number, since it uses less digits than its factorization.

210121201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2033 counting only the distinct ones).

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

Adding to 210121201220 its reverse (22102121012), we get a palindrome (232223322232).

The spelling of 210121201220 in words is "two hundred ten billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty".