2121011231020 has 96 divisors (see below), whose sum is σ = 4930494105600. Its totient is φ = 759948806400.

The previous prime is 2121011230927. The next prime is 2121011231093. The reversal of 2121011231020 is 201321101212.

It is a super-2 number, since 2×2121011231020² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121011230985 and 2121011231003.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26029101 + ... + 26110459.

It is an arithmetic number, because the mean of its divisors is an integer number (51359313600).

Almost surely, 2^{2121011231020} is an apocalyptic number.

2121011231020 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 2121011231020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2465247052800).

2121011231020 is an abundant number, since it is smaller than the sum of its proper divisors (2809482874580).

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

2121011231020 is a wasteful number, since it uses less digits than its factorization.

2121011231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83119 (or 83117 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2121011231020 its reverse (201321101212), we get a palindrome (2322332332232).

The spelling of 2121011231020 in words is "two trillion, one hundred twenty-one billion, eleven million, two hundred thirty-one thousand, twenty".