2121001102220 has 216 divisors, whose sum is σ = 6120575839728. Its totient is φ = 610237555200.

The previous prime is 2121001102219. The next prime is 2121001102303. The reversal of 2121001102220 is 222011001212.

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 = 2121001102195 and 2121001102204.

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, 1239710 + ... + 2403930.

It is an arithmetic number, because the mean of its divisors is an integer number (28335999258).

Almost surely, 2^{2121001102220} is an apocalyptic number.

2121001102220 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 2121001102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3060287919864).

2121001102220 is an abundant number, since it is smaller than the sum of its proper divisors (3999574737508).

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

2121001102220 is a wasteful number, since it uses less digits than its factorization.

2121001102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164281 (or 1164259 counting only the distinct ones).

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

Adding to 2121001102220 its reverse (222011001212), we get a palindrome (2343012103432).

The spelling of 2121001102220 in words is "two trillion, one hundred twenty-one billion, one million, one hundred two thousand, two hundred twenty".