40917949821 has 32 divisors (see below), whose sum is σ = 69704145920. Its totient is φ = 23238222192.

The previous prime is 40917949811. The next prime is 40917949931. The reversal of 40917949821 is 12894971904.

40917949821 is a `hidden beast` number, since 40 + 91 + 7 + 9 + 498 + 21 = 666.

It is not a de Polignac number, because 40917949821 - 2⁹ = 40917949309 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 (40917949811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 633295 + ... + 694908.

It is an arithmetic number, because the mean of its divisors is an integer number (2178254560).

Almost surely, 2^40917949821 is an apocalyptic number.

It is an amenable number.

40917949821 is a deficient number, since it is larger than the sum of its proper divisors (28786196099).

40917949821 is a wasteful number, since it uses less digits than its factorization.

40917949821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328382 (or 1328376 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 40917949821 in words is "forty billion, nine hundred seventeen million, nine hundred forty-nine thousand, eight hundred twenty-one".