21020101010221 has 16 divisors (see below), whose sum is σ = 23235405151104. Its totient is φ = 18914381443584.

The previous prime is 21020101010201. The next prime is 21020101010231. The reversal of 21020101010221 is 12201010102012.

It is not a de Polignac number, because 21020101010221 - 2⁵ = 21020101010189 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 (21020101010201) 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, 12089976 + ... + 13718881.

It is an arithmetic number, because the mean of its divisors is an integer number (1452212821944).

Almost surely, 2^{21020101010221} is an apocalyptic number.

It is an amenable number.

21020101010221 is a deficient number, since it is larger than the sum of its proper divisors (2215304140883).

21020101010221 is a wasteful number, since it uses less digits than its factorization.

21020101010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25810980.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020101010221 its reverse (12201010102012), we get a palindrome (33221111112233).

The spelling of 21020101010221 in words is "twenty-one trillion, twenty billion, one hundred one million, ten thousand, two hundred twenty-one".