21110311202213 has 4 divisors (see below), whose sum is σ = 21165429508608. Its totient is φ = 21055192895820.

The previous prime is 21110311202203. The next prime is 21110311202221. The reversal of 21110311202213 is 31220211301112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110311202213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110311202203) 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, 27559152623 + ... + 27559153388.

It is an arithmetic number, because the mean of its divisors is an integer number (5291357377152).

Almost surely, 2^{21110311202213} is an apocalyptic number.

It is an amenable number.

21110311202213 is a deficient number, since it is larger than the sum of its proper divisors (55118306395).

21110311202213 is an equidigital number, since it uses as much as digits as its factorization.

21110311202213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55118306394.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21110311202213 its reverse (31220211301112), we get a palindrome (52330522503325).

The spelling of 21110311202213 in words is "twenty-one trillion, one hundred ten billion, three hundred eleven million, two hundred two thousand, two hundred thirteen".