43261421 has 4 divisors (see below), whose sum is σ = 49441632. Its totient is φ = 37081212.

The previous prime is 43261411. The next prime is 43261451. The reversal of 43261421 is 12416234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43261421 - 2¹⁸ = 42999277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43261411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090095 + ... + 3090108.

It is an arithmetic number, because the mean of its divisors is an integer number (12360408).

Almost surely, 2^43261421 is an apocalyptic number.

It is an amenable number.

43261421 is a deficient number, since it is larger than the sum of its proper divisors (6180211).

43261421 is an equidigital number, since it uses as much as digits as its factorization.

43261421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180210.

The product of its digits is 1152, while the sum is 23.

The square root of 43261421 is about 6577.3414842169. The cubic root of 43261421 is about 351.0483425162.

Adding to 43261421 its reverse (12416234), we get a palindrome (55677655).

The spelling of 43261421 in words is "forty-three million, two hundred sixty-one thousand, four hundred twenty-one".