21230131127 has 2 divisors, whose sum is σ = 21230131128. Its totient is φ = 21230131126.

The previous prime is 21230131121. The next prime is 21230131211. The reversal of 21230131127 is 72113103212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230131127 - 2¹² = 21230127031 is a prime.

It is a super-2 number, since 2×21230131127² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230131121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615065563 + 10615065564.

It is an arithmetic number, because the mean of its divisors is an integer number (10615065564).

Almost surely, 2^21230131127 is an apocalyptic number.

21230131127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230131127 is an equidigital number, since it uses as much as digits as its factorization.

21230131127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 21230131127 its reverse (72113103212), we get a palindrome (93343234339).

The spelling of 21230131127 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, one hundred twenty-seven".