43221856801 has 2 divisors, whose sum is σ = 43221856802. Its totient is φ = 43221856800.

The previous prime is 43221856763. The next prime is 43221856813. The reversal of 43221856801 is 10865812234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31762368400 + 11459488401 = 178220^2 + 107049^2 .

It is a cyclic number.

It is not a de Polignac number, because 43221856801 - 2¹⁵ = 43221824033 is a prime.

It is a super-2 number, since 2×43221856801² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43221856831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610928400 + 21610928401.

It is an arithmetic number, because the mean of its divisors is an integer number (21610928401).

Almost surely, 2^43221856801 is an apocalyptic number.

It is an amenable number.

43221856801 is a deficient number, since it is larger than the sum of its proper divisors (1).

43221856801 is an equidigital number, since it uses as much as digits as its factorization.

43221856801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 43221856801 in words is "forty-three billion, two hundred twenty-one million, eight hundred fifty-six thousand, eight hundred one".