21010384021223 has 4 divisors (see below), whose sum is σ = 21010633300608. Its totient is φ = 21010134741840.

The previous prime is 21010384021111. The next prime is 21010384021229. The reversal of 21010384021223 is 32212048301012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010384021223 - 2²⁴ = 21010367244007 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 (21010384021229) 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, 124513223 + ... + 124681848.

It is an arithmetic number, because the mean of its divisors is an integer number (5252658325152).

Almost surely, 2^{21010384021223} is an apocalyptic number.

21010384021223 is a deficient number, since it is larger than the sum of its proper divisors (249279385).

21010384021223 is an equidigital number, since it uses as much as digits as its factorization.

21010384021223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249279384.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21010384021223 in words is "twenty-one trillion, ten billion, three hundred eighty-four million, twenty-one thousand, two hundred twenty-three".