21523454132011 has 8 divisors (see below), whose sum is σ = 24399057315920. Its totient is φ = 18822129928992.

The previous prime is 21523454131961. The next prime is 21523454132053. The reversal of 21523454132011 is 11023145432512.

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

It is not a de Polignac number, because 21523454132011 - 2³¹ = 21521306648363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21523454132071) 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, 43569744960 + ... + 43569745453.

It is an arithmetic number, because the mean of its divisors is an integer number (3049882164490).

Almost surely, 2^{21523454132011} is an apocalyptic number.

21523454132011 is a deficient number, since it is larger than the sum of its proper divisors (2875603183909).

21523454132011 is a wasteful number, since it uses less digits than its factorization.

21523454132011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87139490445.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21523454132011 its reverse (11023145432512), we get a palindrome (32546599564523).

The spelling of 21523454132011 in words is "twenty-one trillion, five hundred twenty-three billion, four hundred fifty-four million, one hundred thirty-two thousand, eleven".