21011233231001 has 16 divisors (see below), whose sum is σ = 23878398129600. Its totient is φ = 18327913167168.

The previous prime is 21011233230989. The next prime is 21011233231019. The reversal of 21011233231001 is 10013233211012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011233231001 - 2²² = 21011229036697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011233201001) 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, 107037611 + ... + 107233728.

It is an arithmetic number, because the mean of its divisors is an integer number (1492399883100).

Almost surely, 2^{21011233231001} is an apocalyptic number.

It is an amenable number.

21011233231001 is a deficient number, since it is larger than the sum of its proper divisors (2867164898599).

21011233231001 is a wasteful number, since it uses less digits than its factorization.

21011233231001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214271768.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21011233231001 its reverse (10013233211012), we get a palindrome (31024466442013).

The spelling of 21011233231001 in words is "twenty-one trillion, eleven billion, two hundred thirty-three million, two hundred thirty-one thousand, one".