21216426312303 has 72 divisors (see below), whose sum is σ = 32572027328256. Its totient is φ = 13305543926400.

The previous prime is 21216426312293. The next prime is 21216426312317. The reversal of 21216426312303 is 30321362461212.

21216426312303 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 642 + 6 + 3 + 1 + 2 + 3 + 0 + 3 = 666.

It is not a de Polignac number, because 21216426312303 - 2⁹ = 21216426311791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216426312373) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 345620673 + ... + 345682053.

It is an arithmetic number, because the mean of its divisors is an integer number (452389268448).

Almost surely, 2^{21216426312303} is an apocalyptic number.

21216426312303 is a deficient number, since it is larger than the sum of its proper divisors (11355601015953).

21216426312303 is a wasteful number, since it uses less digits than its factorization.

21216426312303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62173 (or 62151 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

Adding to 21216426312303 its reverse (30321362461212), we get a palindrome (51537788773515).

The spelling of 21216426312303 in words is "twenty-one trillion, two hundred sixteen billion, four hundred twenty-six million, three hundred twelve thousand, three hundred three".