21111031221213 has 4 divisors (see below), whose sum is σ = 28148041628288. Its totient is φ = 14074020814140.

The previous prime is 21111031221193. The next prime is 21111031221223. The reversal of 21111031221213 is 31212213011112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21111031221213 - 2¹³ = 21111031213021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111031221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111031221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518505203533 + ... + 3518505203538.

It is an arithmetic number, because the mean of its divisors is an integer number (7037010407072).

Almost surely, 2^{21111031221213} is an apocalyptic number.

It is an amenable number.

21111031221213 is a deficient number, since it is larger than the sum of its proper divisors (7037010407075).

21111031221213 is an equidigital number, since it uses as much as digits as its factorization.

21111031221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037010407074.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21111031221213 its reverse (31212213011112), we get a palindrome (52323244232325).

The spelling of 21111031221213 in words is "twenty-one trillion, one hundred eleven billion, thirty-one million, two hundred twenty-one thousand, two hundred thirteen".