43401221 has 8 divisors (see below), whose sum is σ = 46287360. Its totient is φ = 40552128.

The previous prime is 43401203. The next prime is 43401229. The reversal of 43401221 is 12210434.

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 43401221 - 2¹⁴ = 43384837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 43401221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43401229) 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, 6821 + ... + 11546.

It is an arithmetic number, because the mean of its divisors is an integer number (5785920).

Almost surely, 2^43401221 is an apocalyptic number.

It is an amenable number.

43401221 is a deficient number, since it is larger than the sum of its proper divisors (2886139).

43401221 is a wasteful number, since it uses less digits than its factorization.

43401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18523.

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

The square root of 43401221 is about 6587.9603064985. The cubic root of 43401221 is about 351.4260754397.

Adding to 43401221 its reverse (12210434), we get a palindrome (55611655).

It can be divided in two parts, 4340 and 1221, that multiplied together give a triangular number (5299140 = T₃₂₅₅).

The spelling of 43401221 in words is "forty-three million, four hundred one thousand, two hundred twenty-one".