21043674042437 has 8 divisors (see below), whose sum is σ = 21271768047936. Its totient is φ = 20815807565952.

The previous prime is 21043674042421. The next prime is 21043674042449. The reversal of 21043674042437 is 73424047634012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21043674042437 - 2⁴ = 21043674042421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21043674042391 and 21043674042400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043674042497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56696273 + ... + 57066230.

It is an arithmetic number, because the mean of its divisors is an integer number (2658971005992).

Almost surely, 2^{21043674042437} is an apocalyptic number.

It is an amenable number.

21043674042437 is a deficient number, since it is larger than the sum of its proper divisors (228094005499).

21043674042437 is a wasteful number, since it uses less digits than its factorization.

21043674042437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113764507.

The product of its (nonzero) digits is 2709504, while the sum is 47.

The spelling of 21043674042437 in words is "twenty-one trillion, forty-three billion, six hundred seventy-four million, forty-two thousand, four hundred thirty-seven".