21534201127 has 2 divisors, whose sum is σ = 21534201128. Its totient is φ = 21534201126.

The previous prime is 21534201107. The next prime is 21534201149. The reversal of 21534201127 is 72110243512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21534201127 - 2³¹ = 19386717479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21534201095 and 21534201104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21534201107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767100563 + 10767100564.

It is an arithmetic number, because the mean of its divisors is an integer number (10767100564).

Almost surely, 2^21534201127 is an apocalyptic number.

21534201127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534201127 is an equidigital number, since it uses as much as digits as its factorization.

21534201127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 21534201127 its reverse (72110243512), we get a palindrome (93644444639).

The spelling of 21534201127 in words is "twenty-one billion, five hundred thirty-four million, two hundred one thousand, one hundred twenty-seven".