2121230121312 has 48 divisors (see below), whose sum is σ = 5704039544112. Its totient is φ = 689830932480.

The previous prime is 2121230121301. The next prime is 2121230121347. The reversal of 2121230121312 is 2131210321212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×2121230121312² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 269461273 + ... + 269469144.

It is an arithmetic number, because the mean of its divisors is an integer number (118834157169).

Almost surely, 2^{2121230121312} is an apocalyptic number.

It is an amenable number.

2121230121312 is an abundant number, since it is smaller than the sum of its proper divisors (3582809422800).

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

2121230121312 is a wasteful number, since it uses less digits than its factorization.

2121230121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538930471 (or 538930463 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2121230121312 its reverse (2131210321212), we get a palindrome (4252440442524).

The spelling of 2121230121312 in words is "two trillion, one hundred twenty-one billion, two hundred thirty million, one hundred twenty-one thousand, three hundred twelve".