21536343154 has 8 divisors (see below), whose sum is σ = 32342212188. Its totient is φ = 10755605760.

The previous prime is 21536343137. The next prime is 21536343203. The reversal of 21536343154 is 45134363512.

It can be written as a sum of positive squares in 2 ways, for example, as 21104825625 + 431517529 = 145275^2 + 20773^2 .

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, 6280767 + ... + 6284194.

Almost surely, 2^21536343154 is an apocalyptic number.

21536343154 is a deficient number, since it is larger than the sum of its proper divisors (10805869034).

21536343154 is a wasteful number, since it uses less digits than its factorization.

21536343154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565820.

The product of its digits is 129600, while the sum is 37.

The spelling of 21536343154 in words is "twenty-one billion, five hundred thirty-six million, three hundred forty-three thousand, one hundred fifty-four".