145401021 has 16 divisors (see below), whose sum is σ = 215670400. Its totient is φ = 96816384.

The previous prime is 145401019. The next prime is 145401029. The reversal of 145401021 is 120104541.

145401021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145401021 - 2¹ = 145401019 is a prime.

It is a super-2 number, since 2×145401021² = 42282913815684882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145400985 and 145401003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145401029) 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, 23325 + ... + 28893.

It is an arithmetic number, because the mean of its divisors is an integer number (13479400).

Almost surely, 2^145401021 is an apocalyptic number.

It is an amenable number.

145401021 is a deficient number, since it is larger than the sum of its proper divisors (70269379).

145401021 is an equidigital number, since it uses as much as digits as its factorization.

145401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545 (or 6539 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 145401021 is about 12058.2345722747. The cubic root of 145401021 is about 525.8426630676.

Adding to 145401021 its reverse (120104541), we get a palindrome (265505562).

The spelling of 145401021 in words is "one hundred forty-five million, four hundred one thousand, twenty-one".