144138021 has 8 divisors (see below), whose sum is σ = 196653600. Its totient is φ = 93857232.

The previous prime is 144137999. The next prime is 144138031. The reversal of 144138021 is 120831441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 144138021 - 2⁶ = 144137957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 144137982 and 144138000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144138031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558546 + ... + 558803.

It is an arithmetic number, because the mean of its divisors is an integer number (24581700).

Almost surely, 2^144138021 is an apocalyptic number.

It is an amenable number.

144138021 is a deficient number, since it is larger than the sum of its proper divisors (52515579).

144138021 is a wasteful number, since it uses less digits than its factorization.

144138021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117395.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 144138021 is about 12005.7494976365. The cubic root of 144138021 is about 524.3156871026.

Adding to 144138021 its reverse (120831441), we get a palindrome (264969462).

The spelling of 144138021 in words is "one hundred forty-four million, one hundred thirty-eight thousand, twenty-one".