21213543315303 has 24 divisors (see below), whose sum is σ = 31220272762848. Its totient is φ = 13875373591872.

The previous prime is 21213543315301. The next prime is 21213543315319. The reversal of 21213543315303 is 30351334531212.

21213543315303 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 35 + 4 + 3 + 315 + 303 = 666.

It is not a de Polignac number, because 21213543315303 - 2¹ = 21213543315301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213543315301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58168201 + ... + 58531757.

It is an arithmetic number, because the mean of its divisors is an integer number (1300844698452).

Almost surely, 2^{21213543315303} is an apocalyptic number.

21213543315303 is a deficient number, since it is larger than the sum of its proper divisors (10006729447545).

21213543315303 is a wasteful number, since it uses less digits than its factorization.

21213543315303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485943 (or 485940 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

Adding to 21213543315303 its reverse (30351334531212), we get a palindrome (51564877846515).

The spelling of 21213543315303 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, three hundred three".