221536123663023 has 20 divisors (see below), whose sum is σ = 356393346141448. Its totient is φ = 136329922253520.

The previous prime is 221536123663007. The next prime is 221536123663067. The reversal of 221536123663023 is 320366321635122.

221536123663023 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 3 + 6 + 1 + 2 + 3 + 6 + 630 + 2 + 3 = 666.

It is not a de Polignac number, because 221536123663023 - 2⁴ = 221536123663007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221536123663023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221536123663523) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 105192840193 + ... + 105192842298.

Almost surely, 2^{221536123663023} is an apocalyptic number.

221536123663023 is a deficient number, since it is larger than the sum of its proper divisors (134857222478425).

221536123663023 is a wasteful number, since it uses less digits than its factorization.

221536123663023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210385682516 (or 210385682507 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The spelling of 221536123663023 in words is "two hundred twenty-one trillion, five hundred thirty-six billion, one hundred twenty-three million, six hundred sixty-three thousand, twenty-three".