21522648759 has 8 divisors (see below), whose sum is σ = 29307436800. Its totient is φ = 14043146616.

The previous prime is 21522648757. The next prime is 21522648779. The reversal of 21522648759 is 95784622512.

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

It is not a de Polignac number, because 21522648759 - 2¹ = 21522648757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522648757) 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, 76321309 + ... + 76321590.

It is an arithmetic number, because the mean of its divisors is an integer number (3663429600).

Almost surely, 2^21522648759 is an apocalyptic number.

21522648759 is a deficient number, since it is larger than the sum of its proper divisors (7784788041).

21522648759 is a wasteful number, since it uses less digits than its factorization.

21522648759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152642949.

The product of its digits is 2419200, while the sum is 51.

The spelling of 21522648759 in words is "twenty-one billion, five hundred twenty-two million, six hundred forty-eight thousand, seven hundred fifty-nine".