21013145127 has 12 divisors (see below), whose sum is σ = 32687114824. Its totient is φ = 12931166160.

The previous prime is 21013145081. The next prime is 21013145149. The reversal of 21013145127 is 72154131012.

21013145127 is a `hidden beast` number, since 2 + 10 + 131 + 4 + 512 + 7 = 666.

It is not a de Polignac number, because 21013145127 - 2⁸ = 21013144871 is a prime.

It is a super-2 number, since 2×21013145127² (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 21013145127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013145827) 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, 89799649 + ... + 89799882.

Almost surely, 2^21013145127 is an apocalyptic number.

21013145127 is a deficient number, since it is larger than the sum of its proper divisors (11673969697).

21013145127 is a wasteful number, since it uses less digits than its factorization.

21013145127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179599550 (or 179599547 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 21013145127 its reverse (72154131012), we get a palindrome (93167276139).

The spelling of 21013145127 in words is "twenty-one billion, thirteen million, one hundred forty-five thousand, one hundred twenty-seven".