43042012221 has 16 divisors (see below), whose sum is σ = 61850774720. Its totient is φ = 26467309440.

The previous prime is 43042012157. The next prime is 43042012243. The reversal of 43042012221 is 12221024034.

It is not a de Polignac number, because 43042012221 - 2⁶ = 43042012157 is a prime.

It is a super-2 number, since 2×43042012221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43042012261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366211 + ... + 469248.

It is an arithmetic number, because the mean of its divisors is an integer number (3865673420).

Almost surely, 2^43042012221 is an apocalyptic number.

It is an amenable number.

43042012221 is a deficient number, since it is larger than the sum of its proper divisors (18808762499).

43042012221 is a wasteful number, since it uses less digits than its factorization.

43042012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836796.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 43042012221 its reverse (12221024034), we get a palindrome (55263036255).

The spelling of 43042012221 in words is "forty-three billion, forty-two million, twelve thousand, two hundred twenty-one".