20101231201 has 4 divisors (see below), whose sum is σ = 20205382852. Its totient is φ = 19997079552.

The previous prime is 20101231169. The next prime is 20101231211. The reversal of 20101231201 is 10213210102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13348336225 + 6752894976 = 115535^2 + 82176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101231201 - 2⁵ = 20101231169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101231211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52075536 + ... + 52075921.

It is an arithmetic number, because the mean of its divisors is an integer number (5051345713).

Almost surely, 2^20101231201 is an apocalyptic number.

It is an amenable number.

20101231201 is a deficient number, since it is larger than the sum of its proper divisors (104151651).

20101231201 is a wasteful number, since it uses less digits than its factorization.

20101231201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104151650.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20101231201 its reverse (10213210102), we get a palindrome (30314441303).

The spelling of 20101231201 in words is "twenty billion, one hundred one million, two hundred thirty-one thousand, two hundred one".