145203017921 has 8 divisors (see below), whose sum is σ = 156375440424. Its totient is φ = 134031018240.

The previous prime is 145203017917. The next prime is 145203017977. The reversal of 145203017921 is 129710302541.

It can be written as a sum of positive squares in 4 ways, for example, as 40074034225 + 105128983696 = 200185^2 + 324236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145203017921 - 2² = 145203017917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145203017321) 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 in 7 ways as a sum of consecutive naturals, for example, 1298585 + ... + 1405961.

It is an arithmetic number, because the mean of its divisors is an integer number (19546930053).

Almost surely, 2^145203017921 is an apocalyptic number.

It is an amenable number.

145203017921 is a deficient number, since it is larger than the sum of its proper divisors (11172422503).

145203017921 is a wasteful number, since it uses less digits than its factorization.

145203017921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211411.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 145203017921 in words is "one hundred forty-five billion, two hundred three million, seventeen thousand, nine hundred twenty-one".