145200121 has 24 divisors (see below), whose sum is σ = 166281120. Its totient is φ = 126745080.

The previous prime is 145200113. The next prime is 145200149. The reversal of 145200121 is 121002541.

It is not a de Polignac number, because 145200121 - 2³ = 145200113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145200095 and 145200104.

It is not an unprimeable number, because it can be changed into a prime (145200821) 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, 2460990 + ... + 2461048.

It is an arithmetic number, because the mean of its divisors is an integer number (6928380).

Almost surely, 2^145200121 is an apocalyptic number.

145200121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145200121 is a deficient number, since it is larger than the sum of its proper divisors (21080999).

145200121 is an frugal number, since it uses more digits than its factorization.

145200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 145200121 is about 12049.9012859027. The cubic root of 145200121 is about 525.6003665495.

Adding to 145200121 its reverse (121002541), we get a palindrome (266202662).

The spelling of 145200121 in words is "one hundred forty-five million, two hundred thousand, one hundred twenty-one".