2121312012 has 48 divisors (see below), whose sum is σ = 5017404000. Its totient is φ = 697485312.

The previous prime is 2121312007. The next prime is 2121312031. The reversal of 2121312012 is 2102131212.

It is a junction number, because it is equal to n+sod(n) for n = 2121311982 and 2121312000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366114 + ... + 371862.

It is an arithmetic number, because the mean of its divisors is an integer number (104529250).

Almost surely, 2^2121312012 is an apocalyptic number.

It is an amenable number.

2121312012 is an abundant number, since it is smaller than the sum of its proper divisors (2896091988).

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

2121312012 is a wasteful number, since it uses less digits than its factorization.

2121312012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6170 (or 6168 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121312012 is about 46057.7030690850. The cubic root of 2121312012 is about 1284.8966112622.

Adding to 2121312012 its reverse (2102131212), we get a palindrome (4223443224).

The spelling of 2121312012 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, twelve".