21161521461053 has 8 divisors (see below), whose sum is σ = 21958630854336. Its totient is φ = 20378274840000.

The previous prime is 21161521461029. The next prime is 21161521461061. The reversal of 21161521461053 is 35016412516112.

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

It is a cyclic number.

It is not a de Polignac number, because 21161521461053 - 2³² = 21157226493757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21161521460998 and 21161521461016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161521461253) 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, 3465689948 + ... + 3465696053.

It is an arithmetic number, because the mean of its divisors is an integer number (2744828856792).

Almost surely, 2^{21161521461053} is an apocalyptic number.

It is an amenable number.

21161521461053 is a deficient number, since it is larger than the sum of its proper divisors (797109393283).

21161521461053 is an equidigital number, since it uses as much as digits as its factorization.

21161521461053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6931386115.

The product of its (nonzero) digits is 43200, while the sum is 38.

Adding to 21161521461053 its reverse (35016412516112), we get a palindrome (56177933977165).

The spelling of 21161521461053 in words is "twenty-one trillion, one hundred sixty-one billion, five hundred twenty-one million, four hundred sixty-one thousand, fifty-three".