21023211233231 has 32 divisors (see below), whose sum is σ = 22964256000000. Its totient is φ = 19178425693440.

The previous prime is 21023211233221. The next prime is 21023211233249. The reversal of 21023211233231 is 13233211232012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21023211233231 is a prime.

It is a super-2 number, since 2×21023211233231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023211233231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023211233201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184504505 + ... + 184618413.

It is an arithmetic number, because the mean of its divisors is an integer number (717633000000).

Almost surely, 2^{21023211233231} is an apocalyptic number.

21023211233231 is a deficient number, since it is larger than the sum of its proper divisors (1941044766769).

21023211233231 is a wasteful number, since it uses less digits than its factorization.

21023211233231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117047.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21023211233231 its reverse (13233211232012), we get a palindrome (34256422465243).

The spelling of 21023211233231 in words is "twenty-one trillion, twenty-three billion, two hundred eleven million, two hundred thirty-three thousand, two hundred thirty-one".