2120121203220 has 144 divisors (see below), whose sum is σ = 6606888882048. Its totient is φ = 549915367680.

The previous prime is 2120121203191. The next prime is 2120121203287. The reversal of 2120121203220 is 223021210212.

2120121203220 is a `hidden beast` number, since 2 + 120 + 121 + 203 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2120121203193 and 2120121203202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22243465 + ... + 22338575.

It is an arithmetic number, because the mean of its divisors is an integer number (45881172792).

Almost surely, 2^{2120121203220} is an apocalyptic number.

2120121203220 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 2120121203220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3303444441024).

2120121203220 is an abundant number, since it is smaller than the sum of its proper divisors (4486767678828).

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

2120121203220 is a wasteful number, since it uses less digits than its factorization.

2120121203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98510 (or 98505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 2120121203220 its reverse (223021210212), we get a palindrome (2343142413432).

The spelling of 2120121203220 in words is "two trillion, one hundred twenty billion, one hundred twenty-one million, two hundred three thousand, two hundred twenty".