21507460324161 has 8 divisors (see below), whose sum is σ = 32773272874944. Its totient is φ = 12289977328080.

The previous prime is 21507460324159. The next prime is 21507460324219. The reversal of 21507460324161 is 16142306470512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21507460324161 - 2¹ = 21507460324159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21507460324121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512082388650 + ... + 512082388691.

It is an arithmetic number, because the mean of its divisors is an integer number (4096659109368).

Almost surely, 2^{21507460324161} is an apocalyptic number.

21507460324161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21507460324161 is a deficient number, since it is larger than the sum of its proper divisors (11265812550783).

21507460324161 is a wasteful number, since it uses less digits than its factorization.

21507460324161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024164777351.

The product of its (nonzero) digits is 241920, while the sum is 42.

Adding to 21507460324161 its reverse (16142306470512), we get a palindrome (37649766794673).

The spelling of 21507460324161 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, three hundred twenty-four thousand, one hundred sixty-one".