21532523155135 has 16 divisors (see below), whose sum is σ = 26938802129184. Its totient is φ = 16507952802432.

The previous prime is 21532523155109. The next prime is 21532523155147. The reversal of 21532523155135 is 53155132523512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21532523155135 - 2¹⁹ = 21532522630847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21532523155091 and 21532523155100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944811912 + ... + 944834701.

It is an arithmetic number, because the mean of its divisors is an integer number (1683675133074).

Almost surely, 2^{21532523155135} is an apocalyptic number.

21532523155135 is a deficient number, since it is larger than the sum of its proper divisors (5406278974049).

21532523155135 is a wasteful number, since it uses less digits than its factorization.

21532523155135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889646714.

The product of its digits is 675000, while the sum is 43.

Adding to 21532523155135 its reverse (53155132523512), we get a palindrome (74687655678647).

The spelling of 21532523155135 in words is "twenty-one trillion, five hundred thirty-two billion, five hundred twenty-three million, one hundred fifty-five thousand, one hundred thirty-five".