40400243321 has 4 divisors (see below), whose sum is σ = 40402818192. Its totient is φ = 40397668452.

The previous prime is 40400243297. The next prime is 40400243329. The reversal of 40400243321 is 12334200404.

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 40400243321 - 2³⁰ = 39326501497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40400243329) 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, 1263755 + ... + 1295328.

It is an arithmetic number, because the mean of its divisors is an integer number (10100704548).

Almost surely, 2^40400243321 is an apocalyptic number.

It is an amenable number.

40400243321 is a deficient number, since it is larger than the sum of its proper divisors (2574871).

40400243321 is a wasteful number, since it uses less digits than its factorization.

40400243321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574870.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 40400243321 its reverse (12334200404), we get a palindrome (52734443725).

The spelling of 40400243321 in words is "forty billion, four hundred million, two hundred forty-three thousand, three hundred twenty-one".