21201123031231 has 8 divisors (see below), whose sum is σ = 24907613071824. Its totient is φ = 17791152193920.

The previous prime is 21201123031223. The next prime is 21201123031237. The reversal of 21201123031231 is 13213032110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201123031231 - 2³ = 21201123031223 is a prime.

It is a super-2 number, since 2×21201123031231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201123031237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74129800666 + ... + 74129800951.

It is an arithmetic number, because the mean of its divisors is an integer number (3113451633978).

Almost surely, 2^{21201123031231} is an apocalyptic number.

21201123031231 is a deficient number, since it is larger than the sum of its proper divisors (3706490040593).

21201123031231 is a wasteful number, since it uses less digits than its factorization.

21201123031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148259601641.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21201123031231 its reverse (13213032110212), we get a palindrome (34414155141443).

The spelling of 21201123031231 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-three million, thirty-one thousand, two hundred thirty-one".