20121200012 has 12 divisors (see below), whose sum is σ = 36030986376. Its totient is φ = 9826632480.

The previous prime is 20121199997. The next prime is 20121200053. The reversal of 20121200012 is 21000212102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20121199966 and 20121200002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58491689 + ... + 58492032.

It is an arithmetic number, because the mean of its divisors is an integer number (3002582198).

Almost surely, 2^20121200012 is an apocalyptic number.

It is an amenable number.

20121200012 is a deficient number, since it is larger than the sum of its proper divisors (15909786364).

20121200012 is a wasteful number, since it uses less digits than its factorization.

20121200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116983768 (or 116983766 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20121200012 its reverse (21000212102), we get a palindrome (41121412114).

The spelling of 20121200012 in words is "twenty billion, one hundred twenty-one million, two hundred thousand, twelve".