145504351221 has 16 divisors (see below), whose sum is σ = 199300282944. Its totient is φ = 94357004544.

The previous prime is 145504351217. The next prime is 145504351229. The reversal of 145504351221 is 122153405541.

It is not a de Polignac number, because 145504351221 - 2² = 145504351217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145504351229) 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, 272061 + ... + 604173.

It is an arithmetic number, because the mean of its divisors is an integer number (12456267684).

Almost surely, 2^145504351221 is an apocalyptic number.

It is an amenable number.

145504351221 is a deficient number, since it is larger than the sum of its proper divisors (53795931723).

145504351221 is a wasteful number, since it uses less digits than its factorization.

145504351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336100.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 145504351221 its reverse (122153405541), we get a palindrome (267657756762).

The spelling of 145504351221 in words is "one hundred forty-five billion, five hundred four million, three hundred fifty-one thousand, two hundred twenty-one".