40643675021 has 32 divisors (see below), whose sum is σ = 45944340480. Its totient is φ = 35770924800.

The previous prime is 40643675003. The next prime is 40643675041. The reversal of 40643675021 is 12057634604.

It is a happy number.

40643675021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-40643675021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643675041) 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, 1946366 + ... + 1967136.

It is an arithmetic number, because the mean of its divisors is an integer number (1435760640).

Almost surely, 2^40643675021 is an apocalyptic number.

It is an amenable number.

40643675021 is a deficient number, since it is larger than the sum of its proper divisors (5300665459).

40643675021 is a wasteful number, since it uses less digits than its factorization.

40643675021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20945.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 40643675021 in words is "forty billion, six hundred forty-three million, six hundred seventy-five thousand, twenty-one".