43377541421 has 4 divisors (see below), whose sum is σ = 43423639644. Its totient is φ = 43331443200.

The previous prime is 43377541409. The next prime is 43377541447. The reversal of 43377541421 is 12414577334.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37260580900 + 6116960521 = 193030^2 + 78211^2 .

It is a cyclic number.

It is not a de Polignac number, because 43377541421 - 2¹⁰ = 43377540397 is a prime.

It is a super-2 number, since 2×43377541421² (a number of 22 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 (43377541021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23047700 + ... + 23049581.

It is an arithmetic number, because the mean of its divisors is an integer number (10855909911).

Almost surely, 2^43377541421 is an apocalyptic number.

It is an amenable number.

43377541421 is a deficient number, since it is larger than the sum of its proper divisors (46098223).

43377541421 is an equidigital number, since it uses as much as digits as its factorization.

43377541421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46098222.

The product of its digits is 282240, while the sum is 41.

The spelling of 43377541421 in words is "forty-three billion, three hundred seventy-seven million, five hundred forty-one thousand, four hundred twenty-one".