145331443021 has 8 divisors (see below), whose sum is σ = 153935813880. Its totient is φ = 136733234688.

The previous prime is 145331443013. The next prime is 145331443031. The reversal of 145331443021 is 120344133541.

It can be written as a sum of positive squares in 4 ways, for example, as 227587396 + 145103855625 = 15086^2 + 380925^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 145331443021 - 2³ = 145331443013 is a prime.

It is a super-2 number, since 2×145331443021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145331443031) 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, 1492026 + ... + 1586443.

It is an arithmetic number, because the mean of its divisors is an integer number (19241976735).

Almost surely, 2^145331443021 is an apocalyptic number.

It is an amenable number.

145331443021 is a deficient number, since it is larger than the sum of its proper divisors (8604370859).

145331443021 is a wasteful number, since it uses less digits than its factorization.

145331443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081263.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 145331443021 its reverse (120344133541), we get a palindrome (265675576562).

The spelling of 145331443021 in words is "one hundred forty-five billion, three hundred thirty-one million, four hundred forty-three thousand, twenty-one".