43144432552621 has 8 divisors (see below), whose sum is σ = 45694970312760. Its totient is φ = 40595298121728.

The previous prime is 43144432552601. The next prime is 43144432552687. The reversal of 43144432552621 is 12625523444134.

It can be written as a sum of positive squares in 4 ways, for example, as 8655005079721 + 34489427472900 = 2941939^2 + 5872770^2 .

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 43144432552621 - 2⁷ = 43144432552493 is a prime.

It is a super-2 number, since 2×43144432552621² (a number of 28 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 (43144432552601) 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, 350769006 + ... + 350891983.

It is an arithmetic number, because the mean of its divisors is an integer number (5711871289095).

Almost surely, 2^{43144432552621} is an apocalyptic number.

It is an amenable number.

43144432552621 is a deficient number, since it is larger than the sum of its proper divisors (2550537760139).

43144432552621 is a wasteful number, since it uses less digits than its factorization.

43144432552621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701664623.

The product of its digits is 2764800, while the sum is 46.

Adding to 43144432552621 its reverse (12625523444134), we get a palindrome (55769955996755).

The spelling of 43144432552621 in words is "forty-three trillion, one hundred forty-four billion, four hundred thirty-two million, five hundred fifty-two thousand, six hundred twenty-one".