43421340001221 has 160 divisors (see below), whose sum is σ = 82665802517760. Its totient is φ = 22092266198016.

The previous prime is 43421340001219. The next prime is 43421340001243. The reversal of 43421340001221 is 12210004312434.

43421340001221 is a `hidden beast` number, since 4 + 34 + 2 + 1 + 3 + 400 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 43421340001221 - 2¹ = 43421340001219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421340001421) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 220714726 + ... + 220911368.

It is an arithmetic number, because the mean of its divisors is an integer number (516661265736).

Almost surely, 2^{43421340001221} is an apocalyptic number.

It is an amenable number.

43421340001221 is a deficient number, since it is larger than the sum of its proper divisors (39244462516539).

43421340001221 is a wasteful number, since it uses less digits than its factorization.

43421340001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197737 (or 197728 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 43421340001221 its reverse (12210004312434), we get a palindrome (55631344313655).

The spelling of 43421340001221 in words is "forty-three trillion, four hundred twenty-one billion, three hundred forty million, one thousand, two hundred twenty-one".