43220661021 has 8 divisors (see below), whose sum is σ = 64030608960. Its totient is φ = 28813773996.

The previous prime is 43220661017. The next prime is 43220661049. The reversal of 43220661021 is 12016602234.

43220661021 is a `hidden beast` number, since 4 + 3 + 2 + 20 + 6 + 610 + 21 = 666.

It is not a de Polignac number, because 43220661021 - 2² = 43220661017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1600765223 = 43220661021 / (4 + 3 + 2 + 2 + 0 + 6 + 6 + 1 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43220661061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800382585 + ... + 800382638.

It is an arithmetic number, because the mean of its divisors is an integer number (8003826120).

Almost surely, 2^43220661021 is an apocalyptic number.

It is an amenable number.

43220661021 is a deficient number, since it is larger than the sum of its proper divisors (20809947939).

43220661021 is a wasteful number, since it uses less digits than its factorization.

43220661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600765232 (or 1600765226 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 43220661021 in words is "forty-three billion, two hundred twenty million, six hundred sixty-one thousand, twenty-one".