43772192121 has 16 divisors (see below), whose sum is σ = 66709065728. Its totient is φ = 25009462800.

The previous prime is 43772192089. The next prime is 43772192221. The reversal of 43772192121 is 12129127734.

It is a happy number.

It is not a de Polignac number, because 43772192121 - 2⁵ = 43772192089 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 43772192121.

It is not an unprimeable number, because it can be changed into a prime (43772192221) 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, 38136 + ... + 298326.

It is an arithmetic number, because the mean of its divisors is an integer number (4169316608).

Almost surely, 2^43772192121 is an apocalyptic number.

It is an amenable number.

43772192121 is a deficient number, since it is larger than the sum of its proper divisors (22936873607).

43772192121 is a wasteful number, since it uses less digits than its factorization.

43772192121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268212.

The product of its digits is 42336, while the sum is 39.

The spelling of 43772192121 in words is "forty-three billion, seven hundred seventy-two million, one hundred ninety-two thousand, one hundred twenty-one".