21221131102121 has 4 divisors (see below), whose sum is σ = 21221148762000. Its totient is φ = 21221113442244.

The previous prime is 21221131102111. The next prime is 21221131102123. The reversal of 21221131102121 is 12120113112212.

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 21221131102121 - 2⁶ = 21221131102057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221131102093 and 21221131102102.

It is not an unprimeable number, because it can be changed into a prime (21221131102123) 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, 6884591 + ... + 9478388.

It is an arithmetic number, because the mean of its divisors is an integer number (5305287190500).

Almost surely, 2^{21221131102121} is an apocalyptic number.

It is an amenable number.

21221131102121 is a deficient number, since it is larger than the sum of its proper divisors (17659879).

21221131102121 is a wasteful number, since it uses less digits than its factorization.

21221131102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17659878.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21221131102121 its reverse (12120113112212), we get a palindrome (33341244214333).

The spelling of 21221131102121 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-one million, one hundred two thousand, one hundred twenty-one".