145438718421 has 16 divisors (see below), whose sum is σ = 195792854400. Its totient is φ = 96022732608.

The previous prime is 145438718419. The next prime is 145438718437. The reversal of 145438718421 is 124817834541.

It is not a de Polignac number, because 145438718421 - 2¹ = 145438718419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145438718441) 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, 569080 + ... + 784046.

It is an arithmetic number, because the mean of its divisors is an integer number (12237053400).

Almost surely, 2^145438718421 is an apocalyptic number.

It is an amenable number.

145438718421 is a deficient number, since it is larger than the sum of its proper divisors (50354135979).

145438718421 is a wasteful number, since it uses less digits than its factorization.

145438718421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217148.

The product of its digits is 860160, while the sum is 48.

The spelling of 145438718421 in words is "one hundred forty-five billion, four hundred thirty-eight million, seven hundred eighteen thousand, four hundred twenty-one".