21331102030221 has 16 divisors (see below), whose sum is σ = 29396241102848. Its totient is φ = 13744514602800.

The previous prime is 21331102030187. The next prime is 21331102030229. The reversal of 21331102030221 is 12203020113312.

It is not a de Polignac number, because 21331102030221 - 2¹⁵ = 21331101997453 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 (21331102030229) 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, 145648975 + ... + 145795356.

It is an arithmetic number, because the mean of its divisors is an integer number (1837265068928).

Almost surely, 2^{21331102030221} is an apocalyptic number.

It is an amenable number.

21331102030221 is a deficient number, since it is larger than the sum of its proper divisors (8065139072627).

21331102030221 is a wasteful number, since it uses less digits than its factorization.

21331102030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291445152.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21331102030221 its reverse (12203020113312), we get a palindrome (33534122143533).

The spelling of 21331102030221 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred two million, thirty thousand, two hundred twenty-one".