21603522101 has 8 divisors (see below), whose sum is σ = 25989199680. Its totient is φ = 17542709568.

The previous prime is 21603522053. The next prime is 21603522103. The reversal of 21603522101 is 10122530612.

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 21603522101 - 2⁶ = 21603522037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603522103) 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, 81216116 + ... + 81216381.

It is an arithmetic number, because the mean of its divisors is an integer number (3248649960).

Almost surely, 2^21603522101 is an apocalyptic number.

It is an amenable number.

21603522101 is a deficient number, since it is larger than the sum of its proper divisors (4385677579).

21603522101 is a wasteful number, since it uses less digits than its factorization.

21603522101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162432523.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 21603522101 in words is "twenty-one billion, six hundred three million, five hundred twenty-two thousand, one hundred one".