21604060154 has 4 divisors (see below), whose sum is σ = 32406090234. Its totient is φ = 10802030076.

The previous prime is 21604060151. The next prime is 21604060189. The reversal of 21604060154 is 45106040612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20453290225 + 1150769929 = 143015^2 + 33923^2 .

It is not an unprimeable number, because it can be changed into a prime (21604060151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5401015037 + ... + 5401015040.

Almost surely, 2^21604060154 is an apocalyptic number.

21604060154 is a deficient number, since it is larger than the sum of its proper divisors (10802030080).

21604060154 is a wasteful number, since it uses less digits than its factorization.

21604060154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802030079.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21604060154 in words is "twenty-one billion, six hundred four million, sixty thousand, one hundred fifty-four".