21216362001650 has 12 divisors (see below), whose sum is σ = 39462433323162. Its totient is φ = 8486544800640.

The previous prime is 21216362001599. The next prime is 21216362001671. The reversal of 21216362001650 is 5610026361212.

21216362001650 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 8892604310209 + 12323757691441 = 2982047^2 + 3510521^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21216362001650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212163619967 + ... + 212163620066.

Almost surely, 2^{21216362001650} is an apocalyptic number.

21216362001650 is a deficient number, since it is larger than the sum of its proper divisors (18246071321512).

21216362001650 is a wasteful number, since it uses less digits than its factorization.

21216362001650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424327240045 (or 424327240040 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 21216362001650 its reverse (5610026361212), we get a palindrome (26826388362862).

The spelling of 21216362001650 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, one thousand, six hundred fifty".