40012221509 has 16 divisors (see below), whose sum is σ = 43916112240. Its totient is φ = 36233049600.

The previous prime is 40012221499. The next prime is 40012221517. The reversal of 40012221509 is 90512221004.

It can be written as a sum of positive squares in 8 ways, for example, as 72199009 + 39940022500 = 8497^2 + 199850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40012221509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40012221539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3329 + ... + 282905.

It is an arithmetic number, because the mean of its divisors is an integer number (2744757015).

Almost surely, 2^40012221509 is an apocalyptic number.

It is an amenable number.

40012221509 is a deficient number, since it is larger than the sum of its proper divisors (3903890731).

40012221509 is a wasteful number, since it uses less digits than its factorization.

40012221509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279800.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 40012221509 in words is "forty billion, twelve million, two hundred twenty-one thousand, five hundred nine".