20123103212 has 6 divisors (see below), whose sum is σ = 35215430628. Its totient is φ = 10061551604.

The previous prime is 20123103211. The next prime is 20123103239. The reversal of 20123103212 is 21230132102.

It is not an unprimeable number, because it can be changed into a prime (20123103211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515387898 + ... + 2515387905.

It is an arithmetic number, because the mean of its divisors is an integer number (5869238438).

Almost surely, 2^20123103212 is an apocalyptic number.

It is an amenable number.

20123103212 is a deficient number, since it is larger than the sum of its proper divisors (15092327416).

20123103212 is a wasteful number, since it uses less digits than its factorization.

20123103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030775807 (or 5030775805 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20123103212 its reverse (21230132102), we get a palindrome (41353235314).

The spelling of 20123103212 in words is "twenty billion, one hundred twenty-three million, one hundred three thousand, two hundred twelve".