210121020000220 has 96 divisors (see below), whose sum is σ = 506010723539328. Its totient is φ = 71795838246912.

The previous prime is 210121020000149. The next prime is 210121020000277. The reversal of 210121020000220 is 22000020121012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 210121020000220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203554914 + ... + 204584566.

It is an arithmetic number, because the mean of its divisors is an integer number (5270945036868).

Almost surely, 2^{210121020000220} is an apocalyptic number.

210121020000220 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 210121020000220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253005361769664).

210121020000220 is an abundant number, since it is smaller than the sum of its proper divisors (295889703539108).

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

210121020000220 is a wasteful number, since it uses less digits than its factorization.

210121020000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034639 (or 1034637 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210121020000220 its reverse (22000020121012), we get a palindrome (232121040121232).

The spelling of 210121020000220 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty million, two hundred twenty", and thus it is an aban number.