2121000012 has 48 divisors (see below), whose sum is σ = 5589052000. Its totient is φ = 695407680.

The previous prime is 2120999989. The next prime is 2121000023. The reversal of 2121000012 is 2100001212.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2120999958 and 2121000003.

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, 154387 + ... + 167562.

Almost surely, 2^2121000012 is an apocalyptic number.

It is an amenable number.

2121000012 is an abundant number, since it is smaller than the sum of its proper divisors (3468051988).

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

2121000012 is a wasteful number, since it uses less digits than its factorization.

2121000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322023 (or 322015 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2121000012 is about 46054.3158889588. The cubic root of 2121000012 is about 1284.8336144947.

Adding to 2121000012 its reverse (2100001212), we get a palindrome (4221001224).

The spelling of 2121000012 in words is "two billion, one hundred twenty-one million, twelve", and thus it is an aban number.