21311123210201 has 16 divisors (see below), whose sum is σ = 25033278070080. Its totient is φ = 17925063290880.

The previous prime is 21311123210183. The next prime is 21311123210291. The reversal of 21311123210201 is 10201232111312.

It is a cyclic number.

It is not a de Polignac number, because 21311123210201 - 2²² = 21311119015897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311123210291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965779016 + ... + 965801081.

It is an arithmetic number, because the mean of its divisors is an integer number (1564579879380).

Almost surely, 2^{21311123210201} is an apocalyptic number.

It is an amenable number.

21311123210201 is a deficient number, since it is larger than the sum of its proper divisors (3722154859879).

21311123210201 is a wasteful number, since it uses less digits than its factorization.

21311123210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931580184.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21311123210201 its reverse (10201232111312), we get a palindrome (31512355321513).

The spelling of 21311123210201 in words is "twenty-one trillion, three hundred eleven billion, one hundred twenty-three million, two hundred ten thousand, two hundred one".