21214453313 has 4 divisors (see below), whose sum is σ = 21214945620. Its totient is φ = 21213961008.

The previous prime is 21214453301. The next prime is 21214453361. The reversal of 21214453313 is 31335441212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4608780544 + 16605672769 = 67888^2 + 128863^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214453313 - 2²² = 21210259009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214455313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174578 + ... + 270011.

It is an arithmetic number, because the mean of its divisors is an integer number (5303736405).

Almost surely, 2^21214453313 is an apocalyptic number.

It is an amenable number.

21214453313 is a deficient number, since it is larger than the sum of its proper divisors (492307).

21214453313 is an equidigital number, since it uses as much as digits as its factorization.

21214453313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492306.

The product of its digits is 8640, while the sum is 29.

Adding to 21214453313 its reverse (31335441212), we get a palindrome (52549894525).

The spelling of 21214453313 in words is "twenty-one billion, two hundred fourteen million, four hundred fifty-three thousand, three hundred thirteen".