20121223112 has 8 divisors (see below), whose sum is σ = 37727293350. Its totient is φ = 10060611552.

The previous prime is 20121223051. The next prime is 20121223123. The reversal of 20121223112 is 21132212102.

It can be written as a sum of positive squares in only one way, i.e., 13290861796 + 6830361316 = 115286^2 + 82646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257576437 + ... + 1257576452.

Almost surely, 2^20121223112 is an apocalyptic number.

It is an amenable number.

20121223112 is a deficient number, since it is larger than the sum of its proper divisors (17606070238).

20121223112 is a wasteful number, since it uses less digits than its factorization.

20121223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515152895 (or 2515152891 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121223112 its reverse (21132212102), we get a palindrome (41253435214).

The spelling of 20121223112 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twelve".