21001201127 has 2 divisors, whose sum is σ = 21001201128. Its totient is φ = 21001201126.

The previous prime is 21001200991. The next prime is 21001201129. The reversal of 21001201127 is 72110210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001201127 - 2¹² = 21001197031 is a prime.

Together with 21001201129, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001201129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500600563 + 10500600564.

It is an arithmetic number, because the mean of its divisors is an integer number (10500600564).

Almost surely, 2^21001201127 is an apocalyptic number.

21001201127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001201127 is an equidigital number, since it uses as much as digits as its factorization.

21001201127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21001201127 its reverse (72110210012), we get a palindrome (93111411139).

The spelling of 21001201127 in words is "twenty-one billion, one million, two hundred one thousand, one hundred twenty-seven".