21223203103021 has 4 divisors (see below), whose sum is σ = 21223362274912. Its totient is φ = 21223043931132.

The previous prime is 21223203102967. The next prime is 21223203103049. The reversal of 21223203103021 is 12030130232212.

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 not a de Polignac number, because 21223203103021 - 2¹³ = 21223203094829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223203102983 and 21223203103001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223203103051) 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, 79385775 + ... + 79652668.

It is an arithmetic number, because the mean of its divisors is an integer number (5305840568728).

Almost surely, 2^{21223203103021} is an apocalyptic number.

It is an amenable number.

21223203103021 is a deficient number, since it is larger than the sum of its proper divisors (159171891).

21223203103021 is a wasteful number, since it uses less digits than its factorization.

21223203103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159171890.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21223203103021 its reverse (12030130232212), we get a palindrome (33253333335233).

The spelling of 21223203103021 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred three million, one hundred three thousand, twenty-one".