20121212320 has 48 divisors (see below), whose sum is σ = 51857856288. Its totient is φ = 7316803840.

The previous prime is 20121212317. The next prime is 20121212329. The reversal of 20121212320 is 2321212102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20121212294 and 20121212303.

It is not an unprimeable number, because it can be changed into a prime (20121212329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5714494 + ... + 5718013.

It is an arithmetic number, because the mean of its divisors is an integer number (1080372006).

Almost surely, 2^20121212320 is an apocalyptic number.

20121212320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121212320 is an abundant number, since it is smaller than the sum of its proper divisors (31736643968).

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

20121212320 is a wasteful number, since it uses less digits than its factorization.

20121212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432533 (or 11432525 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121212320 its reverse (2321212102), we get a palindrome (22442424422).

The spelling of 20121212320 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty".