145452104142221 has 4 divisors (see below), whose sum is σ = 154008110268252. Its totient is φ = 136896098016192.

The previous prime is 145452104142173. The next prime is 145452104142277. The reversal of 145452104142221 is 122241401254541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119542843609225 + 25909260532996 = 10933565^2 + 5090114^2 .

It is a cyclic number.

It is not a de Polignac number, because 145452104142221 - 2⁶ = 145452104142157 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 (145452104742221) 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, 4278003062990 + ... + 4278003063023.

It is an arithmetic number, because the mean of its divisors is an integer number (38502027567063).

Almost surely, 2^{145452104142221} is an apocalyptic number.

It is an amenable number.

145452104142221 is a deficient number, since it is larger than the sum of its proper divisors (8556006126031).

145452104142221 is an equidigital number, since it uses as much as digits as its factorization.

145452104142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8556006126030.

The product of its (nonzero) digits is 102400, while the sum is 38.

Adding to 145452104142221 its reverse (122241401254541), we get a palindrome (267693505396762).

The spelling of 145452104142221 in words is "one hundred forty-five trillion, four hundred fifty-two billion, one hundred four million, one hundred forty-two thousand, two hundred twenty-one".