21021001122223 has 16 divisors (see below), whose sum is σ = 22215147609600. Its totient is φ = 19835657287200.

The previous prime is 21021001122137. The next prime is 21021001122229. The reversal of 21021001122223 is 32222110012012.

It is a cyclic number.

It is not a de Polignac number, because 21021001122223 - 2¹³ = 21021001114031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 21021001122223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021001122229) 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, 30394593 + ... + 31078501.

It is an arithmetic number, because the mean of its divisors is an integer number (1388446725600).

Almost surely, 2^{21021001122223} is an apocalyptic number.

21021001122223 is a deficient number, since it is larger than the sum of its proper divisors (1194146487377).

21021001122223 is a wasteful number, since it uses less digits than its factorization.

21021001122223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690342.

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

Adding to 21021001122223 its reverse (32222110012012), we get a palindrome (53243111134235).

The spelling of 21021001122223 in words is "twenty-one trillion, twenty-one billion, one million, one hundred twenty-two thousand, two hundred twenty-three".