2121121022220 has 192 divisors, whose sum is σ = 6888067200000. Its totient is φ = 540873856512.

The previous prime is 2121121022183. The next prime is 2121121022231. The reversal of 2121121022220 is 222201211212.

It is a happy number.

2121121022220 is a `hidden beast` number, since 2 + 1 + 211 + 210 + 22 + 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 = 2121121022193 and 2121121022202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43433176 + ... + 43481984.

It is an arithmetic number, because the mean of its divisors is an integer number (35875350000).

Almost surely, 2^{2121121022220} is an apocalyptic number.

2121121022220 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 2121121022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3444033600000).

2121121022220 is an abundant number, since it is smaller than the sum of its proper divisors (4766946177780).

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

2121121022220 is a wasteful number, since it uses less digits than its factorization.

2121121022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52349 (or 52341 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121121022220 its reverse (222201211212), we get a palindrome (2343322233432).

The spelling of 2121121022220 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty".