21216351055233 has 16 divisors (see below), whose sum is σ = 28294398449856. Its totient is φ = 14141269159680.

The previous prime is 21216351055231. The next prime is 21216351055243. The reversal of 21216351055233 is 33255015361212.

It is not a de Polignac number, because 21216351055233 - 2¹ = 21216351055231 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21216351055191 and 21216351055200.

It is not an unprimeable number, because it can be changed into a prime (21216351055231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410181813 + ... + 410233533.

It is an arithmetic number, because the mean of its divisors is an integer number (1768399903116).

Almost surely, 2^{21216351055233} is an apocalyptic number.

It is an amenable number.

21216351055233 is a deficient number, since it is larger than the sum of its proper divisors (7078047394623).

21216351055233 is a wasteful number, since it uses less digits than its factorization.

21216351055233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77744.

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 21216351055233 in words is "twenty-one trillion, two hundred sixteen billion, three hundred fifty-one million, fifty-five thousand, two hundred thirty-three".