40021220009 has 4 divisors (see below), whose sum is σ = 40433810004. Its totient is φ = 39608630016.

The previous prime is 40021219999. The next prime is 40021220047. The reversal of 40021220009 is 90002212004.

40021220009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28610707609 + 11410512400 = 169147^2 + 106820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40021220009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021222009) 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, 206294852 + ... + 206295045.

It is an arithmetic number, because the mean of its divisors is an integer number (10108452501).

Almost surely, 2^40021220009 is an apocalyptic number.

It is an amenable number.

40021220009 is a deficient number, since it is larger than the sum of its proper divisors (412589995).

40021220009 is an equidigital number, since it uses as much as digits as its factorization.

40021220009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412589994.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 40021220009 in words is "forty billion, twenty-one million, two hundred twenty thousand, nine".