40678700021 has 4 divisors (see below), whose sum is σ = 40787758572. Its totient is φ = 40569641472.

The previous prime is 40678699993. The next prime is 40678700033. The reversal of 40678700021 is 12000787604.

It is a happy number.

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 29623228996 + 11055471025 = 172114^2 + 105145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40678700021 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 (40678700521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54528716 + ... + 54529461.

It is an arithmetic number, because the mean of its divisors is an integer number (10196939643).

Almost surely, 2^40678700021 is an apocalyptic number.

It is an amenable number.

40678700021 is a deficient number, since it is larger than the sum of its proper divisors (109058551).

40678700021 is a wasteful number, since it uses less digits than its factorization.

40678700021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109058550.

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 40678700021 in words is "forty billion, six hundred seventy-eight million, seven hundred thousand, twenty-one".