21530434132053 has 24 divisors (see below), whose sum is σ = 38773422507456. Its totient is φ = 11184641107200.

The previous prime is 21530434132049. The next prime is 21530434132061. The reversal of 21530434132053 is 35023143403512.

21530434132053 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 0 + 434 + 13 + 205 + 3 = 666.

It is not a de Polignac number, because 21530434132053 - 2² = 21530434132049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21530434131999 and 21530434132017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530434132003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15534223068 + ... + 15534224453.

It is an arithmetic number, because the mean of its divisors is an integer number (1615559271144).

Almost surely, 2^{21530434132053} is an apocalyptic number.

It is an amenable number.

21530434132053 is a deficient number, since it is larger than the sum of its proper divisors (17242988375403).

21530434132053 is a wasteful number, since it uses less digits than its factorization.

21530434132053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31068447545 (or 31068447542 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 21530434132053 its reverse (35023143403512), we get a palindrome (56553577535565).

The spelling of 21530434132053 in words is "twenty-one trillion, five hundred thirty billion, four hundred thirty-four million, one hundred thirty-two thousand, fifty-three".