221525161320423 has 4 divisors (see below), whose sum is σ = 295366881760568. Its totient is φ = 147683440880280.

The previous prime is 221525161320367. The next prime is 221525161320427. The reversal of 221525161320423 is 324023161525122.

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

It is not a de Polignac number, because 221525161320423 - 2²¹ = 221525159223271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221525161320427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36920860220068 + ... + 36920860220073.

It is an arithmetic number, because the mean of its divisors is an integer number (73841720440142).

Almost surely, 2^{221525161320423} is an apocalyptic number.

221525161320423 is a deficient number, since it is larger than the sum of its proper divisors (73841720440145).

221525161320423 is an equidigital number, since it uses as much as digits as its factorization.

221525161320423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73841720440144.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 221525161320423 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, one hundred sixty-one million, three hundred twenty thousand, four hundred twenty-three".