21100131127 has 2 divisors, whose sum is σ = 21100131128. Its totient is φ = 21100131126.

The previous prime is 21100131097. The next prime is 21100131131. The reversal of 21100131127 is 72113100112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100131127 - 2¹⁵ = 21100098359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101131127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550065563 + 10550065564.

It is an arithmetic number, because the mean of its divisors is an integer number (10550065564).

Almost surely, 2^21100131127 is an apocalyptic number.

21100131127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100131127 is an equidigital number, since it uses as much as digits as its factorization.

21100131127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 21100131127 its reverse (72113100112), we get a palindrome (93213231239).

The spelling of 21100131127 in words is "twenty-one billion, one hundred million, one hundred thirty-one thousand, one hundred twenty-seven".