21500016106 has 8 divisors (see below), whose sum is σ = 32254885764. Its totient is φ = 10748387520.

The previous prime is 21500016101. The next prime is 21500016157. The reversal of 21500016106 is 60161000512.

It can be written as a sum of positive squares in 2 ways, for example, as 21479540481 + 20475625 = 146559^2 + 4525^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21500016101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793615 + ... + 820258.

Almost surely, 2^21500016106 is an apocalyptic number.

21500016106 is a deficient number, since it is larger than the sum of its proper divisors (10754869658).

21500016106 is a wasteful number, since it uses less digits than its factorization.

21500016106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620536.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 21500016106 its reverse (60161000512), we get a palindrome (81661016618).

The spelling of 21500016106 in words is "twenty-one billion, five hundred million, sixteen thousand, one hundred six".