21110100321 has 8 divisors (see below), whose sum is σ = 28273020160. Its totient is φ = 14010290352.

The previous prime is 21110100313. The next prime is 21110100329. The reversal of 21110100321 is 12300101112.

It is an interprime number because it is at equal distance from previous prime (21110100313) and next prime (21110100329).

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

It is not a de Polignac number, because 21110100321 - 2³ = 21110100313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110100297 and 21110100306.

It is not an unprimeable number, because it can be changed into a prime (21110100329) 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, 15776686 + ... + 15778023.

It is an arithmetic number, because the mean of its divisors is an integer number (3534127520).

Almost surely, 2^21110100321 is an apocalyptic number.

It is an amenable number.

21110100321 is a deficient number, since it is larger than the sum of its proper divisors (7162919839).

21110100321 is a wasteful number, since it uses less digits than its factorization.

21110100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31554935.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21110100321 its reverse (12300101112), we get a palindrome (33410201433).

The spelling of 21110100321 in words is "twenty-one billion, one hundred ten million, one hundred thousand, three hundred twenty-one".