2121021351312 has 80 divisors (see below), whose sum is σ = 5544829929600. Its totient is φ = 698582900736.

The previous prime is 2121021351307. The next prime is 2121021351347. The reversal of 2121021351312 is 2131531201212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1742118 + ... + 2697594.

It is an arithmetic number, because the mean of its divisors is an integer number (69310374120).

Almost surely, 2^{2121021351312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121021351312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772414964800).

2121021351312 is an abundant number, since it is smaller than the sum of its proper divisors (3423808578288).

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

2121021351312 is a wasteful number, since it uses less digits than its factorization.

2121021351312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956040 (or 956034 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 2121021351312 its reverse (2131531201212), we get a palindrome (4252552552524).

The spelling of 2121021351312 in words is "two trillion, one hundred twenty-one billion, twenty-one million, three hundred fifty-one thousand, three hundred twelve".