20121200040 has 64 divisors (see below), whose sum is σ = 60435849600. Its totient is φ = 5359231232.

The previous prime is 20121199997. The next prime is 20121200053. The reversal of 20121200040 is 4000212102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20121199989 and 20121200025.

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, 754 + ... + 200606.

It is an arithmetic number, because the mean of its divisors is an integer number (944310150).

Almost surely, 2^20121200040 is an apocalyptic number.

20121200040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121200040 is an abundant number, since it is smaller than the sum of its proper divisors (40314649560).

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

20121200040 is a wasteful number, since it uses less digits than its factorization.

20121200040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200706 (or 200702 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20121200040 its reverse (4000212102), we get a palindrome (24121412142).

The spelling of 20121200040 in words is "twenty billion, one hundred twenty-one million, two hundred thousand, forty".