145717522021 has 4 divisors (see below), whose sum is σ = 145753783200. Its totient is φ = 145681260844.

The previous prime is 145717522019. The next prime is 145717522033. The reversal of 145717522021 is 120225717541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145717522021 - 2¹ = 145717522019 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 (145717522421) 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, 18124561 + ... + 18132598.

It is an arithmetic number, because the mean of its divisors is an integer number (36438445800).

Almost surely, 2^145717522021 is an apocalyptic number.

It is an amenable number.

145717522021 is a deficient number, since it is larger than the sum of its proper divisors (36261179).

145717522021 is an equidigital number, since it uses as much as digits as its factorization.

145717522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36261178.

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 145717522021 in words is "one hundred forty-five billion, seven hundred seventeen million, five hundred twenty-two thousand, twenty-one".