21532411206 has 24 divisors (see below), whose sum is σ = 46853796600. Its totient is φ = 7146664416.

The previous prime is 21532411169. The next prime is 21532411247. The reversal of 21532411206 is 60211423512.

21532411206 is a `hidden beast` number, since 2 + 1 + 532 + 4 + 1 + 120 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21532411206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2562856 + ... + 2571243.

It is an arithmetic number, because the mean of its divisors is an integer number (1952241525).

Almost surely, 2^21532411206 is an apocalyptic number.

21532411206 is an abundant number, since it is smaller than the sum of its proper divisors (25321385394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21532411206 is a wasteful number, since it uses less digits than its factorization.

21532411206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134340 (or 5134337 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21532411206 its reverse (60211423512), we get a palindrome (81743834718).

The spelling of 21532411206 in words is "twenty-one billion, five hundred thirty-two million, four hundred eleven thousand, two hundred six".