2123400012 has 12 divisors (see below), whose sum is σ = 4954600056. Its totient is φ = 707800000.

The previous prime is 2123399987. The next prime is 2123400017. The reversal of 2123400012 is 2100043212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2123400012² = 9017655221923200288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2123399964 and 2123400000.

It is not an unprimeable number, because it can be changed into a prime (2123400017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88474989 + ... + 88475012.

It is an arithmetic number, because the mean of its divisors is an integer number (412883338).

Almost surely, 2^2123400012 is an apocalyptic number.

It is an amenable number.

2123400012 is an abundant number, since it is smaller than the sum of its proper divisors (2831200044).

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

2123400012 is a wasteful number, since it uses less digits than its factorization.

2123400012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176950008 (or 176950006 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2123400012 is about 46080.3647120984. The cubic root of 2123400012 is about 1285.3180461015.

Adding to 2123400012 its reverse (2100043212), we get a palindrome (4223443224).

The spelling of 2123400012 in words is "two billion, one hundred twenty-three million, four hundred thousand, twelve".