21146136511055 has 16 divisors (see below), whose sum is σ = 25645225346400. Its totient is φ = 16737450733440.

The previous prime is 21146136511033. The next prime is 21146136511061. The reversal of 21146136511055 is 55011563164112.

It is not a de Polignac number, because 21146136511055 - 2³⁸ = 20871258604111 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27698840 + ... + 28452029.

It is an arithmetic number, because the mean of its divisors is an integer number (1602826584150).

Almost surely, 2^{21146136511055} is an apocalyptic number.

21146136511055 is a deficient number, since it is larger than the sum of its proper divisors (4499088835345).

21146136511055 is a wasteful number, since it uses less digits than its factorization.

21146136511055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56151674.

The product of its (nonzero) digits is 108000, while the sum is 41.

Adding to 21146136511055 its reverse (55011563164112), we get a palindrome (76157699675167).

The spelling of 21146136511055 in words is "twenty-one trillion, one hundred forty-six billion, one hundred thirty-six million, five hundred eleven thousand, fifty-five".