43402121 has 4 divisors (see below), whose sum is σ = 49602432. Its totient is φ = 37201812.

The previous prime is 43402109. The next prime is 43402133. The reversal of 43402121 is 12120434.

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 an interprime number because it is at equal distance from previous prime (43402109) and next prime (43402133).

It is a cyclic number.

It is not a de Polignac number, because 43402121 - 2¹⁴ = 43385737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43402121.

It is not an unprimeable number, because it can be changed into a prime (43402181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100145 + ... + 3100158.

It is an arithmetic number, because the mean of its divisors is an integer number (12400608).

Almost surely, 2^43402121 is an apocalyptic number.

It is an amenable number.

43402121 is a deficient number, since it is larger than the sum of its proper divisors (6200311).

43402121 is an equidigital number, since it uses as much as digits as its factorization.

43402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200310.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 43402121 is about 6588.0286125669. The cubic root of 43402121 is about 351.4285045671.

Adding to 43402121 its reverse (12120434), we get a palindrome (55522555).

The spelling of 43402121 in words is "forty-three million, four hundred two thousand, one hundred twenty-one".