145442121 has 24 divisors (see below), whose sum is σ = 215319552. Its totient is φ = 87252000.

The previous prime is 145442069. The next prime is 145442147. The reversal of 145442121 is 121244541.

It is not a de Polignac number, because 145442121 - 2⁶ = 145442057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145442091 and 145442100.

It is not an unprimeable number, because it can be changed into a prime (145432121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34680 + ... + 38646.

It is an arithmetic number, because the mean of its divisors is an integer number (8971648).

Almost surely, 2^145442121 is an apocalyptic number.

145442121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145442121 is a deficient number, since it is larger than the sum of its proper divisors (69877431).

145442121 is a wasteful number, since it uses less digits than its factorization.

145442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093 (or 4082 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 145442121 is about 12059.9386814362. The cubic root of 145442121 is about 525.8922044378.

Adding to 145442121 its reverse (121244541), we get a palindrome (266686662).

The spelling of 145442121 in words is "one hundred forty-five million, four hundred forty-two thousand, one hundred twenty-one".