21223212212031 has 4 divisors (see below), whose sum is σ = 28297616282712. Its totient is φ = 14148808141352.

The previous prime is 21223212212011. The next prime is 21223212212051. The reversal of 21223212212031 is 13021221232212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21223212212011) and next prime (21223212212051).

It is a cyclic number.

It is not a de Polignac number, because 21223212212031 - 2⁹ = 21223212211519 is a prime.

It is a super-2 number, since 2×21223212212031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223212211992 and 21223212212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223212212011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3537202035336 + ... + 3537202035341.

It is an arithmetic number, because the mean of its divisors is an integer number (7074404070678).

Almost surely, 2^{21223212212031} is an apocalyptic number.

21223212212031 is a deficient number, since it is larger than the sum of its proper divisors (7074404070681).

21223212212031 is an equidigital number, since it uses as much as digits as its factorization.

21223212212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074404070680.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21223212212031 its reverse (13021221232212), we get a palindrome (34244433444243).

The spelling of 21223212212031 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twelve million, two hundred twelve thousand, thirty-one".