43558990021 has 4 divisors (see below), whose sum is σ = 43765430944. Its totient is φ = 43352549100.

The previous prime is 43558989997. The next prime is 43558990049. The reversal of 43558990021 is 12009985534.

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 43558990021 - 2¹¹ = 43558987973 is a prime.

It is a super-2 number, since 2×43558990021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43558990051) 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, 103220145 + ... + 103220566.

It is an arithmetic number, because the mean of its divisors is an integer number (10941357736).

Almost surely, 2^43558990021 is an apocalyptic number.

It is an amenable number.

43558990021 is a deficient number, since it is larger than the sum of its proper divisors (206440923).

43558990021 is a wasteful number, since it uses less digits than its factorization.

43558990021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206440922.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 43558990021 in words is "forty-three billion, five hundred fifty-eight million, nine hundred ninety thousand, twenty-one".