21243134442213 has 16 divisors (see below), whose sum is σ = 31471388956800. Its totient is φ = 14162054225760.

The previous prime is 21243134442197. The next prime is 21243134442223. The reversal of 21243134442213 is 31224443134212.

21243134442213 is a `hidden beast` number, since 2 + 1 + 2 + 431 + 3 + 4 + 4 + 4 + 2 + 213 = 666.

It is not a de Polignac number, because 21243134442213 - 2⁴ = 21243134442197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243134442223) 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, 14383353 + ... + 15791361.

It is an arithmetic number, because the mean of its divisors is an integer number (1966961809800).

Almost surely, 2^{21243134442213} is an apocalyptic number.

It is an amenable number.

21243134442213 is a deficient number, since it is larger than the sum of its proper divisors (10228254514587).

21243134442213 is a wasteful number, since it uses less digits than its factorization.

21243134442213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966809 (or 1966803 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

Adding to 21243134442213 its reverse (31224443134212), we get a palindrome (52467577576425).

The spelling of 21243134442213 in words is "twenty-one trillion, two hundred forty-three billion, one hundred thirty-four million, four hundred forty-two thousand, two hundred thirteen".