20121223012 has 24 divisors (see below), whose sum is σ = 38417000832. Its totient is φ = 9145116000.

The previous prime is 20121223007. The next prime is 20121223013. The reversal of 20121223012 is 21032212102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20121223013) 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, 681762 + ... + 710662.

It is an arithmetic number, because the mean of its divisors is an integer number (1600708368).

Almost surely, 2^20121223012 is an apocalyptic number.

20121223012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20121223012 is a deficient number, since it is larger than the sum of its proper divisors (18295777820).

20121223012 is a wasteful number, since it uses less digits than its factorization.

20121223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44739 (or 44737 counting only the distinct ones).

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

Adding to 20121223012 its reverse (21032212102), we get a palindrome (41153435114).

The spelling of 20121223012 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, twelve".