145222021193 has 2 divisors, whose sum is σ = 145222021194. Its totient is φ = 145222021192.

The previous prime is 145222021171. The next prime is 145222021213. The reversal of 145222021193 is 391120222541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84699625024 + 60522396169 = 291032^2 + 246013^2 .

It is a cyclic number.

It is not a de Polignac number, because 145222021193 - 2²⁸ = 144953585737 is a prime.

It is a super-2 number, since 2×145222021193² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145222021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72611010596 + 72611010597.

It is an arithmetic number, because the mean of its divisors is an integer number (72611010597).

Almost surely, 2^145222021193 is an apocalyptic number.

It is an amenable number.

145222021193 is a deficient number, since it is larger than the sum of its proper divisors (1).

145222021193 is an equidigital number, since it uses as much as digits as its factorization.

145222021193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 145222021193 in words is "one hundred forty-five billion, two hundred twenty-two million, twenty-one thousand, one hundred ninety-three".