21604500002 has 4 divisors (see below), whose sum is σ = 32406750006. Its totient is φ = 10802250000.

The previous prime is 21604499977. The next prime is 21604500017. The reversal of 21604500002 is 20000540612.

It is a happy number.

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., 16095743161 + 5508756841 = 126869^2 + 74221^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5401124999 + ... + 5401125002.

Almost surely, 2^21604500002 is an apocalyptic number.

21604500002 is a deficient number, since it is larger than the sum of its proper divisors (10802250004).

21604500002 is a wasteful number, since it uses less digits than its factorization.

21604500002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10802250003.

The product of its (nonzero) digits is 480, while the sum is 20.

The spelling of 21604500002 in words is "twenty-one billion, six hundred four million, five hundred thousand, two".