21123260127 has 12 divisors (see below), whose sum is σ = 32117237880. Its totient is φ = 13341006288.

The previous prime is 21123260117. The next prime is 21123260129. The reversal of 21123260127 is 72106232112.

21123260127 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 32 + 601 + 27 = 666.

It is not a de Polignac number, because 21123260127 - 2⁴ = 21123260111 is a prime.

It is a super-2 number, since 2×21123260127² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21123260127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123260129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61763748 + ... + 61764089.

It is an arithmetic number, because the mean of its divisors is an integer number (2676436490).

Almost surely, 2^21123260127 is an apocalyptic number.

21123260127 is a deficient number, since it is larger than the sum of its proper divisors (10993977753).

21123260127 is a wasteful number, since it uses less digits than its factorization.

21123260127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123527862 (or 123527859 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 21123260127 its reverse (72106232112), we get a palindrome (93229492239).

The spelling of 21123260127 in words is "twenty-one billion, one hundred twenty-three million, two hundred sixty thousand, one hundred twenty-seven".