21144234031 has 2 divisors, whose sum is σ = 21144234032. Its totient is φ = 21144234030.

The previous prime is 21144234019. The next prime is 21144234049. The reversal of 21144234031 is 13043244112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21144234031 - 2²⁵ = 21110679599 is a prime.

It is a super-2 number, since 2×21144234031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21144233987 and 21144234005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21144234071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572117015 + 10572117016.

It is an arithmetic number, because the mean of its divisors is an integer number (10572117016).

Almost surely, 2^21144234031 is an apocalyptic number.

21144234031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144234031 is an equidigital number, since it uses as much as digits as its factorization.

21144234031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21144234031 its reverse (13043244112), we get a palindrome (34187478143).

The spelling of 21144234031 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, thirty-one".