21011012022223 has 4 divisors (see below), whose sum is σ = 21021367377640. Its totient is φ = 21000656666808.

The previous prime is 21011012022151. The next prime is 21011012022239. The reversal of 21011012022223 is 32222021011012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011012022223 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 21011012022223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011012022293) 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, 5177674665 + ... + 5177678722.

It is an arithmetic number, because the mean of its divisors is an integer number (5255341844410).

Almost surely, 2^{21011012022223} is an apocalyptic number.

21011012022223 is a deficient number, since it is larger than the sum of its proper divisors (10355355417).

21011012022223 is a wasteful number, since it uses less digits than its factorization.

21011012022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10355355416.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21011012022223 its reverse (32222021011012), we get a palindrome (53233033033235).

The spelling of 21011012022223 in words is "twenty-one trillion, eleven billion, twelve million, twenty-two thousand, two hundred twenty-three".