21002321101 has 16 divisors (see below), whose sum is σ = 23017065840. Its totient is φ = 19074908160.

The previous prime is 21002321047. The next prime is 21002321141. The reversal of 21002321101 is 10112320012.

It can be written as a sum of positive squares in 8 ways, for example, as 4339383876 + 16662937225 = 65874^2 + 129085^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002321101 - 2⁹ = 21002320589 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 (21002321141) 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, 983821 + ... + 1004941.

It is an arithmetic number, because the mean of its divisors is an integer number (1438566615).

Almost surely, 2^21002321101 is an apocalyptic number.

It is an amenable number.

21002321101 is a deficient number, since it is larger than the sum of its proper divisors (2014744739).

21002321101 is a wasteful number, since it uses less digits than its factorization.

21002321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23184.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21002321101 its reverse (10112320012), we get a palindrome (31114641113).

The spelling of 21002321101 in words is "twenty-one billion, two million, three hundred twenty-one thousand, one hundred one".