21213544250313 has 12 divisors (see below), whose sum is σ = 30642729647088. Its totient is φ = 14141927368440.

The previous prime is 21213544250303. The next prime is 21213544250323. The reversal of 21213544250313 is 31305244531212.

21213544250313 is a `hidden beast` number, since 2 + 1 + 2 + 135 + 4 + 4 + 2 + 503 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (21213544250303) and next prime (21213544250323).

It is not a de Polignac number, because 21213544250313 - 2⁹ = 21213544249801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213544250303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35980095 + ... + 36564932.

It is an arithmetic number, because the mean of its divisors is an integer number (2553560803924).

Almost surely, 2^{21213544250313} is an apocalyptic number.

It is an amenable number.

21213544250313 is a deficient number, since it is larger than the sum of its proper divisors (9429185396775).

21213544250313 is a wasteful number, since it uses less digits than its factorization.

21213544250313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72577524 (or 72577521 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21213544250313 its reverse (31305244531212), we get a palindrome (52518788781525).

The spelling of 21213544250313 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-four million, two hundred fifty thousand, three hundred thirteen".