21151104130513 has 6 divisors (see below), whose sum is σ = 24604345621266. Its totient is φ = 18129517826112.

The previous prime is 21151104130501. The next prime is 21151104130543. The reversal of 21151104130513 is 31503140115112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18964692393409 + 2186411737104 = 4354847^2 + 1478652^2 .

It is not a de Polignac number, because 21151104130513 - 2²¹ = 21151102033361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151104130543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215827593120 + ... + 215827593217.

It is an arithmetic number, because the mean of its divisors is an integer number (4100724270211).

Almost surely, 2^{21151104130513} is an apocalyptic number.

It is an amenable number.

21151104130513 is a deficient number, since it is larger than the sum of its proper divisors (3453241490753).

21151104130513 is an equidigital number, since it uses as much as digits as its factorization.

21151104130513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431655186351 (or 431655186344 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 21151104130513 its reverse (31503140115112), we get a palindrome (52654244245625).

The spelling of 21151104130513 in words is "twenty-one trillion, one hundred fifty-one billion, one hundred four million, one hundred thirty thousand, five hundred thirteen".