40261156421 has 4 divisors (see below), whose sum is σ = 40278902700. Its totient is φ = 40243410144.

The previous prime is 40261156393. The next prime is 40261156447. The reversal of 40261156421 is 12465116204.

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 14473293025 + 25787863396 = 120305^2 + 160586^2 .

It is a cyclic number.

It is not a de Polignac number, because 40261156421 - 2²² = 40256962117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40261153421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8869736 + ... + 8874273.

It is an arithmetic number, because the mean of its divisors is an integer number (10069725675).

Almost surely, 2^40261156421 is an apocalyptic number.

It is an amenable number.

40261156421 is a deficient number, since it is larger than the sum of its proper divisors (17746279).

40261156421 is a wasteful number, since it uses less digits than its factorization.

40261156421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17746278.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 40261156421 in words is "forty billion, two hundred sixty-one million, one hundred fifty-six thousand, four hundred twenty-one".