21532352545 has 8 divisors (see below), whose sum is σ = 28187807040. Its totient is φ = 15659892720.

The previous prime is 21532352533. The next prime is 21532352549. The reversal of 21532352545 is 54525323512.

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

It is not a de Polignac number, because 21532352545 - 2²¹ = 21530255393 is a prime.

It is a super-2 number, since 2×21532352545² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21532352549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195748605 + ... + 195748714.

It is an arithmetic number, because the mean of its divisors is an integer number (3523475880).

Almost surely, 2^21532352545 is an apocalyptic number.

It is an amenable number.

21532352545 is a deficient number, since it is larger than the sum of its proper divisors (6655454495).

21532352545 is a wasteful number, since it uses less digits than its factorization.

21532352545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391497335.

The product of its digits is 180000, while the sum is 37.

The spelling of 21532352545 in words is "twenty-one billion, five hundred thirty-two million, three hundred fifty-two thousand, five hundred forty-five".