145456421 has 16 divisors (see below), whose sum is σ = 161421120. Its totient is φ = 129966720.

The previous prime is 145456387. The next prime is 145456453. The reversal of 145456421 is 124654541.

It is a cyclic number.

It is not a de Polignac number, because 145456421 - 2¹⁸ = 145194277 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 (145453421) 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, 285515 + ... + 286023.

It is an arithmetic number, because the mean of its divisors is an integer number (10088820).

Almost surely, 2^145456421 is an apocalyptic number.

145456421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145456421 is a deficient number, since it is larger than the sum of its proper divisors (15964699).

145456421 is a wasteful number, since it uses less digits than its factorization.

145456421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916.

The product of its digits is 19200, while the sum is 32.

The square root of 145456421 is about 12060.5315388668. The cubic root of 145456421 is about 525.9094392709.

It can be divided in two parts, 1454 and 56421, that added together give a palindrome (57875).

The spelling of 145456421 in words is "one hundred forty-five million, four hundred fifty-six thousand, four hundred twenty-one".