21233121211231 has 8 divisors (see below), whose sum is σ = 22248235256544. Its totient is φ = 20225668404480.

The previous prime is 21233121211201. The next prime is 21233121211261. The reversal of 21233121211231 is 13211212133212.

It is an interprime number because it is at equal distance from previous prime (21233121211201) and next prime (21233121211261).

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 21233121211231 - 2³¹ = 21230973727583 is a prime.

It is a super-2 number, since 2×21233121211231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233121211196 and 21233121211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233121211201) 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, 1915303966 + ... + 1915315051.

It is an arithmetic number, because the mean of its divisors is an integer number (2781029407068).

Almost surely, 2^{21233121211231} is an apocalyptic number.

21233121211231 is a deficient number, since it is larger than the sum of its proper divisors (1015114045313).

21233121211231 is a wasteful number, since it uses less digits than its factorization.

21233121211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830619281.

The product of its digits is 864, while the sum is 25.

Adding to 21233121211231 its reverse (13211212133212), we get a palindrome (34444333344443).

The spelling of 21233121211231 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred twenty-one million, two hundred eleven thousand, two hundred thirty-one".