21533525533245 has 32 divisors (see below), whose sum is σ = 37589605194240. Its totient is φ = 10439437458240.

The previous prime is 21533525533229. The next prime is 21533525533291. The reversal of 21533525533245 is 54233552533512.

It is a happy number.

It is not a de Polignac number, because 21533525533245 - 2⁴ = 21533525533229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21533525533194 and 21533525533203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4991899 + ... + 8245368.

It is an arithmetic number, because the mean of its divisors is an integer number (1174675162320).

Almost surely, 2^{21533525533245} is an apocalyptic number.

It is an amenable number.

21533525533245 is a deficient number, since it is larger than the sum of its proper divisors (16056079660995).

21533525533245 is a wasteful number, since it uses less digits than its factorization.

21533525533245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247145.

The product of its digits is 8100000, while the sum is 48.

The spelling of 21533525533245 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred twenty-five million, five hundred thirty-three thousand, two hundred forty-five".