43045502021 has 4 divisors (see below), whose sum is σ = 43074451392. Its totient is φ = 43016552652.

The previous prime is 43045502009. The next prime is 43045502023. The reversal of 43045502021 is 12020554034.

It is a happy number.

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 43045502021 - 2²² = 43041307717 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 (43045502023) 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, 14472455 + ... + 14475428.

It is an arithmetic number, because the mean of its divisors is an integer number (10768612848).

Almost surely, 2^43045502021 is an apocalyptic number.

It is an amenable number.

43045502021 is a deficient number, since it is larger than the sum of its proper divisors (28949371).

43045502021 is a wasteful number, since it uses less digits than its factorization.

43045502021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28949370.

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 43045502021 in words is "forty-three billion, forty-five million, five hundred two thousand, twenty-one".