40121554243 has 16 divisors (see below), whose sum is σ = 41288113152. Its totient is φ = 38966256000.

The previous prime is 40121554241. The next prime is 40121554261. The reversal of 40121554243 is 34245512104.

It is not a de Polignac number, because 40121554243 - 2¹ = 40121554241 is a prime.

It is a super-2 number, since 2×40121554243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40121554241) 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 15 ways as a sum of consecutive naturals, for example, 5760283 + ... + 5767243.

It is an arithmetic number, because the mean of its divisors is an integer number (2580507072).

Almost surely, 2^40121554243 is an apocalyptic number.

40121554243 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

40121554243 is a deficient number, since it is larger than the sum of its proper divisors (1166558909).

40121554243 is a wasteful number, since it uses less digits than its factorization.

40121554243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7746.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 40121554243 in words is "forty billion, one hundred twenty-one million, five hundred fifty-four thousand, two hundred forty-three".