145422511221 has 16 divisors (see below), whose sum is σ = 209149183040. Its totient is φ = 89346188160.

The previous prime is 145422511187. The next prime is 145422511231. The reversal of 145422511221 is 122115224541.

It is not a de Polignac number, because 145422511221 - 2⁷ = 145422511093 is a prime.

It is a super-2 number, since 2×145422511221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145422511231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2987800 + ... + 3036081.

It is an arithmetic number, because the mean of its divisors is an integer number (13071823940).

Almost surely, 2^145422511221 is an apocalyptic number.

It is an amenable number.

145422511221 is a deficient number, since it is larger than the sum of its proper divisors (63726671819).

145422511221 is a wasteful number, since it uses less digits than its factorization.

145422511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024516.

The product of its digits is 6400, while the sum is 30.

Adding to 145422511221 its reverse (122115224541), we get a palindrome (267537735762).

The spelling of 145422511221 in words is "one hundred forty-five billion, four hundred twenty-two million, five hundred eleven thousand, two hundred twenty-one".