145717522221 has 16 divisors (see below), whose sum is σ = 195069222720. Its totient is φ = 96756199680.

The previous prime is 145717522219. The next prime is 145717522231. The reversal of 145717522221 is 122225717541.

It is not a de Polignac number, because 145717522221 - 2¹ = 145717522219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145717522221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145717522231) 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, 652581 + ... + 846933.

It is an arithmetic number, because the mean of its divisors is an integer number (12191826420).

Almost surely, 2^145717522221 is an apocalyptic number.

It is an amenable number.

145717522221 is a deficient number, since it is larger than the sum of its proper divisors (49351700499).

145717522221 is a wasteful number, since it uses less digits than its factorization.

145717522221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195356.

The product of its digits is 78400, while the sum is 39.

The spelling of 145717522221 in words is "one hundred forty-five billion, seven hundred seventeen million, five hundred twenty-two thousand, two hundred twenty-one".