2121321213220 has 96 divisors (see below), whose sum is σ = 4870690755840. Its totient is φ = 769655631360.

The previous prime is 2121321213211. The next prime is 2121321213227. The reversal of 2121321213220 is 223121231212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 2121321213191 and 2121321213200.

It is not an unprimeable number, because it can be changed into a prime (2121321213227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190094001 + ... + 190105159.

It is an arithmetic number, because the mean of its divisors is an integer number (50736362040).

Almost surely, 2^{2121321213220} is an apocalyptic number.

2121321213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121321213220 is an abundant number, since it is smaller than the sum of its proper divisors (2749369542620).

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

2121321213220 is a wasteful number, since it uses less digits than its factorization.

2121321213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13045 (or 13043 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2121321213220 its reverse (223121231212), we get a palindrome (2344442444432).

The spelling of 2121321213220 in words is "two trillion, one hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred twenty".