43752023221 has 4 divisors (see below), whose sum is σ = 44014011552. Its totient is φ = 43490034892.

The previous prime is 43752023207. The next prime is 43752023239. The reversal of 43752023221 is 12232025734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43752023221 - 2⁷ = 43752023093 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 (43752024221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130993915 + ... + 130994248.

It is an arithmetic number, because the mean of its divisors is an integer number (11003502888).

Almost surely, 2^43752023221 is an apocalyptic number.

It is an amenable number.

43752023221 is a deficient number, since it is larger than the sum of its proper divisors (261988331).

43752023221 is a wasteful number, since it uses less digits than its factorization.

43752023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261988330.

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 43752023221 its reverse (12232025734), we get a palindrome (55984048955).

The spelling of 43752023221 in words is "forty-three billion, seven hundred fifty-two million, twenty-three thousand, two hundred twenty-one".