21036418606834 has 8 divisors (see below), whose sum is σ = 31623675237468. Its totient is φ = 10495193527680.

The previous prime is 21036418606793. The next prime is 21036418606871. The reversal of 21036418606834 is 43860681463012.

It can be written as a sum of positive squares in 2 ways, for example, as 20540809646809 + 495608960025 = 4532197^2 + 703995^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11507886727 + ... + 11507888554.

Almost surely, 2^{21036418606834} is an apocalyptic number.

21036418606834 is a deficient number, since it is larger than the sum of its proper divisors (10587256630634).

21036418606834 is a wasteful number, since it uses less digits than its factorization.

21036418606834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23015775740.

The product of its (nonzero) digits is 3981312, while the sum is 52.

The spelling of 21036418606834 in words is "twenty-one trillion, thirty-six billion, four hundred eighteen million, six hundred six thousand, eight hundred thirty-four".