40826991821 has 16 divisors (see below), whose sum is σ = 50905788288. Its totient is φ = 31810363200.

The previous prime is 40826991773. The next prime is 40826991827. The reversal of 40826991821 is 12819962804.

40826991821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40826991821 - 2¹⁴ = 40826975437 is a prime.

It is a super-2 number, since 2×40826991821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40826991821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40826991827) 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, 1316231 + ... + 1346891.

It is an arithmetic number, because the mean of its divisors is an integer number (3181611768).

Almost surely, 2^40826991821 is an apocalyptic number.

It is an amenable number.

40826991821 is a deficient number, since it is larger than the sum of its proper divisors (10078796467).

40826991821 is a wasteful number, since it uses less digits than its factorization.

40826991821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47972.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 40826991821 in words is "forty billion, eight hundred twenty-six million, nine hundred ninety-one thousand, eight hundred twenty-one".