21124432223231 has 2 divisors, whose sum is σ = 21124432223232. Its totient is φ = 21124432223230.

The previous prime is 21124432223207. The next prime is 21124432223267. The reversal of 21124432223231 is 13232223442112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124432223231 is a prime.

It is a super-2 number, since 2×21124432223231² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124432223131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562216111615 + 10562216111616.

It is an arithmetic number, because the mean of its divisors is an integer number (10562216111616).

Almost surely, 2^{21124432223231} is an apocalyptic number.

21124432223231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124432223231 is an equidigital number, since it uses as much as digits as its factorization.

21124432223231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 32.

Adding to 21124432223231 its reverse (13232223442112), we get a palindrome (34356655665343).

It can be divided in two parts, 211 and 24432223231, that added together give a palindrome (24432223442).

The spelling of 21124432223231 in words is "twenty-one trillion, one hundred twenty-four billion, four hundred thirty-two million, two hundred twenty-three thousand, two hundred thirty-one".