21906577533 has 8 divisors (see below), whose sum is σ = 29209468896. Its totient is φ = 14604035600.

The previous prime is 21906577489. The next prime is 21906577579. The reversal of 21906577533 is 33577560912.

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 21906577533 - 2¹⁷ = 21906446461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906577333) 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, 154918 + ... + 260408.

It is an arithmetic number, because the mean of its divisors is an integer number (3651183612).

Almost surely, 2^21906577533 is an apocalyptic number.

It is an amenable number.

21906577533 is a deficient number, since it is larger than the sum of its proper divisors (7302891363).

21906577533 is a wasteful number, since it uses less digits than its factorization.

21906577533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174715.

The product of its (nonzero) digits is 1190700, while the sum is 48.

The spelling of 21906577533 in words is "twenty-one billion, nine hundred six million, five hundred seventy-seven thousand, five hundred thirty-three".