20012112001 has 24 divisors (see below), whose sum is σ = 23918358240. Its totient is φ = 16688431872.

The previous prime is 20012111971. The next prime is 20012112017. The reversal of 20012112001 is 10021121002.

It is a de Polignac number, because none of the positive numbers 2^k-20012112001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20012112061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244746 + ... + 316108.

It is an arithmetic number, because the mean of its divisors is an integer number (996598260).

Almost surely, 2^20012112001 is an apocalyptic number.

It is an amenable number.

20012112001 is a deficient number, since it is larger than the sum of its proper divisors (3906246239).

20012112001 is an equidigital number, since it uses as much as digits as its factorization.

20012112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71533 (or 71526 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20012112001 its reverse (10021121002), we get a palindrome (30033233003).

Subtracting from 20012112001 its reverse (10021121002), we obtain a palindrome (9990990999).

The spelling of 20012112001 in words is "twenty billion, twelve million, one hundred twelve thousand, one".