221023650643423 has 16 divisors (see below), whose sum is σ = 234536294228544. Its totient is φ = 207567826767360.

The previous prime is 221023650643409. The next prime is 221023650643531. The reversal of 221023650643423 is 324346056320122.

It is a cyclic number.

It is not a de Polignac number, because 221023650643423 - 2²¹ = 221023648546271 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 221023650643423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221023650643403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624330061 + ... + 624683977.

It is an arithmetic number, because the mean of its divisors is an integer number (14658518389284).

Almost surely, 2^{221023650643423} is an apocalyptic number.

221023650643423 is a deficient number, since it is larger than the sum of its proper divisors (13512643585121).

221023650643423 is a wasteful number, since it uses less digits than its factorization.

221023650643423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434082.

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 221023650643423 in words is "two hundred twenty-one trillion, twenty-three billion, six hundred fifty million, six hundred forty-three thousand, four hundred twenty-three".