21533525310533 has 8 divisors (see below), whose sum is σ = 21676335841368. Its totient is φ = 21390786353664.

The previous prime is 21533525310491. The next prime is 21533525310547. The reversal of 21533525310533 is 33501352533512.

It can be written as a sum of positive squares in 4 ways, for example, as 1061728281604 + 20471797028929 = 1030402^2 + 4524577^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21533525310533 - 2¹² = 21533525306437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533525319533) 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, 17289716 + ... + 18493277.

It is an arithmetic number, because the mean of its divisors is an integer number (2709541980171).

Almost surely, 2^{21533525310533} is an apocalyptic number.

It is an amenable number.

21533525310533 is a deficient number, since it is larger than the sum of its proper divisors (142810530835).

21533525310533 is a wasteful number, since it uses less digits than its factorization.

21533525310533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35786983.

The product of its (nonzero) digits is 607500, while the sum is 41.

The spelling of 21533525310533 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred twenty-five million, three hundred ten thousand, five hundred thirty-three".