21636531154 has 8 divisors (see below), whose sum is σ = 37091196288. Its totient is φ = 9272799060.

The previous prime is 21636531131. The next prime is 21636531187. The reversal of 21636531154 is 45113563612.

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, 772733242 + ... + 772733269.

It is an arithmetic number, because the mean of its divisors is an integer number (4636399536).

Almost surely, 2^21636531154 is an apocalyptic number.

21636531154 is a deficient number, since it is larger than the sum of its proper divisors (15454665134).

21636531154 is a wasteful number, since it uses less digits than its factorization.

21636531154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545466520.

The product of its digits is 64800, while the sum is 37.

The spelling of 21636531154 in words is "twenty-one billion, six hundred thirty-six million, five hundred thirty-one thousand, one hundred fifty-four".