145115021 has 8 divisors (see below), whose sum is σ = 148970880. Its totient is φ = 141309792.

The previous prime is 145115011. The next prime is 145115023. The reversal of 145115021 is 120511541.

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 145115021 - 2¹⁴ = 145098637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145114984 and 145115002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145115023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6815 + ... + 18348.

It is an arithmetic number, because the mean of its divisors is an integer number (18621360).

Almost surely, 2^145115021 is an apocalyptic number.

It is an amenable number.

145115021 is a deficient number, since it is larger than the sum of its proper divisors (3855859).

145115021 is an equidigital number, since it uses as much as digits as its factorization.

145115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25315.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 145115021 is about 12046.3696191010. The cubic root of 145115021 is about 525.4976638520.

Adding to 145115021 its reverse (120511541), we get a palindrome (265626562).

The spelling of 145115021 in words is "one hundred forty-five million, one hundred fifteen thousand, twenty-one".