21233121311031 has 16 divisors (see below), whose sum is σ = 34258481443584. Its totient is φ = 11419493814144.

The previous prime is 21233121311011. The next prime is 21233121311033. The reversal of 21233121311031 is 13011312133212.

It is not a de Polignac number, because 21233121311031 - 2¹⁴ = 21233121294647 is a prime.

It is a super-2 number, since 2×21233121311031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233121310992 and 21233121311010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233121311033) 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, 29738264785 + ... + 29738265498.

It is an arithmetic number, because the mean of its divisors is an integer number (2141155090224).

Almost surely, 2^{21233121311031} is an apocalyptic number.

21233121311031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21233121311031 is a deficient number, since it is larger than the sum of its proper divisors (13025360132553).

21233121311031 is a wasteful number, since it uses less digits than its factorization.

21233121311031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59476530310.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21233121311031 its reverse (13011312133212), we get a palindrome (34244433444243).

It can be divided in two parts, 2123312 and 1311031, that added together give a palindrome (3434343).

The spelling of 21233121311031 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred twenty-one million, three hundred eleven thousand, thirty-one".