22101522521 has 4 divisors (see below), whose sum is σ = 23801639652. Its totient is φ = 20401405392.

The previous prime is 22101522517. The next prime is 22101522529. The reversal of 22101522521 is 12522510122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10539896896 + 11561625625 = 102664^2 + 107525^2 .

It is a cyclic number.

It is not a de Polignac number, because 22101522521 - 2² = 22101522517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22101522529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850058546 + ... + 850058571.

It is an arithmetic number, because the mean of its divisors is an integer number (5950409913).

Almost surely, 2^22101522521 is an apocalyptic number.

It is an amenable number.

22101522521 is a deficient number, since it is larger than the sum of its proper divisors (1700117131).

22101522521 is a wasteful number, since it uses less digits than its factorization.

22101522521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700117130.

The product of its (nonzero) digits is 800, while the sum is 23.

The spelling of 22101522521 in words is "twenty-two billion, one hundred one million, five hundred twenty-two thousand, five hundred twenty-one".