43135125221 has 16 divisors (see below), whose sum is σ = 46333292544. Its totient is φ = 40058685744.

The previous prime is 43135125107. The next prime is 43135125227. The reversal of 43135125221 is 12252153134.

It is a cyclic number.

It is not a de Polignac number, because 43135125221 - 2¹⁸ = 43134863077 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 (43135125227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34580 + ... + 295746.

It is an arithmetic number, because the mean of its divisors is an integer number (2895830784).

Almost surely, 2^43135125221 is an apocalyptic number.

It is an amenable number.

43135125221 is a deficient number, since it is larger than the sum of its proper divisors (3198167323).

43135125221 is a wasteful number, since it uses less digits than its factorization.

43135125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261400.

The product of its digits is 7200, while the sum is 29.

Adding to 43135125221 its reverse (12252153134), we get a palindrome (55387278355).

The spelling of 43135125221 in words is "forty-three billion, one hundred thirty-five million, one hundred twenty-five thousand, two hundred twenty-one".