145442421 has 12 divisors (see below), whose sum is σ = 216860800. Its totient is φ = 93833640.

The previous prime is 145442399. The next prime is 145442431. The reversal of 145442421 is 124244541.

145442421 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 145442421 - 2⁵ = 145442389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145442431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260371 + ... + 260928.

Almost surely, 2^145442421 is an apocalyptic number.

It is an amenable number.

145442421 is a deficient number, since it is larger than the sum of its proper divisors (71418379).

145442421 is a wasteful number, since it uses less digits than its factorization.

145442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521336 (or 521333 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 145442421 is about 12059.9511193039. The cubic root of 145442421 is about 525.8925660193.

Adding to 145442421 its reverse (124244541), we get a palindrome (269686962).

The spelling of 145442421 in words is "one hundred forty-five million, four hundred forty-two thousand, four hundred twenty-one".