2102121200220 has 96 divisors (see below), whose sum is σ = 6036544335360. Its totient is φ = 546281729280.

The previous prime is 2102121200171. The next prime is 2102121200237. The reversal of 2102121200220 is 220021212012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2102121200220.

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, 204630 + ... + 2060610.

It is an arithmetic number, because the mean of its divisors is an integer number (62880670160).

Almost surely, 2^{2102121200220} is an apocalyptic number.

2102121200220 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 2102121200220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3018272167680).

2102121200220 is an abundant number, since it is smaller than the sum of its proper divisors (3934423135140).

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

2102121200220 is a wasteful number, since it uses less digits than its factorization.

2102121200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856475 (or 1856473 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2102121200220 its reverse (220021212012), we get a palindrome (2322142412232).

The spelling of 2102121200220 in words is "two trillion, one hundred two billion, one hundred twenty-one million, two hundred thousand, two hundred twenty".