2121111020220 has 48 divisors (see below), whose sum is σ = 5969883484320. Its totient is φ = 562698878976.

The previous prime is 2121111020209. The next prime is 2121111020221. The reversal of 2121111020220 is 220201111212.

It is a super-2 number, since 2×2121111020220² (a number of 25 digits) contains 22 as substring.

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 2121111020220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121111020221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91573525 + ... + 91596684.

It is an arithmetic number, because the mean of its divisors is an integer number (124372572590).

Almost surely, 2^{2121111020220} is an apocalyptic number.

2121111020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121111020220 is an abundant number, since it is smaller than the sum of its proper divisors (3848772464100).

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

2121111020220 is a wasteful number, since it uses less digits than its factorization.

2121111020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183170414 (or 183170412 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121111020220 its reverse (220201111212), we get a palindrome (2341312131432).

The spelling of 2121111020220 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, twenty thousand, two hundred twenty".