21216361516033 has 32 divisors (see below), whose sum is σ = 24288978003840. Its totient is φ = 18403700567040.

The previous prime is 21216361516027. The next prime is 21216361516037. The reversal of 21216361516033 is 33061516361212.

It is a cyclic number.

It is not a de Polignac number, because 21216361516033 - 2¹³ = 21216361507841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21216361516037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95054343 + ... + 95277283.

It is an arithmetic number, because the mean of its divisors is an integer number (759030562620).

Almost surely, 2^{21216361516033} is an apocalyptic number.

It is an amenable number.

21216361516033 is a deficient number, since it is larger than the sum of its proper divisors (3072616487807).

21216361516033 is a wasteful number, since it uses less digits than its factorization.

21216361516033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230977.

The product of its (nonzero) digits is 116640, while the sum is 40.

Adding to 21216361516033 its reverse (33061516361212), we get a palindrome (54277877877245).

The spelling of 21216361516033 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-one million, five hundred sixteen thousand, thirty-three".