21100321121 has 8 divisors (see below), whose sum is σ = 23081257344. Its totient is φ = 19129839120.

The previous prime is 21100321087. The next prime is 21100321127. The reversal of 21100321121 is 12112300112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100321121 - 2²² = 21096126817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100321096 and 21100321105.

It is not an unprimeable number, because it can be changed into a prime (21100321127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609330 + ... + 2617403.

It is an arithmetic number, because the mean of its divisors is an integer number (2885157168).

Almost surely, 2^21100321121 is an apocalyptic number.

It is an amenable number.

21100321121 is a deficient number, since it is larger than the sum of its proper divisors (1980936223).

21100321121 is a wasteful number, since it uses less digits than its factorization.

21100321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227111.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21100321121 its reverse (12112300112), we get a palindrome (33212621233).

The spelling of 21100321121 in words is "twenty-one billion, one hundred million, three hundred twenty-one thousand, one hundred twenty-one".