21110100001001 has 8 divisors (see below), whose sum is σ = 23032974734208. Its totient is φ = 19187854390000.

The previous prime is 21110100000961. The next prime is 21110100001019. The reversal of 21110100001001 is 10010000101112.

It is a happy number.

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 21110100001001 - 2⁶ = 21110100000937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110100001001.

It is not an unprimeable number, because it can be changed into a prime (21110100501001) 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, 157210385 + ... + 157344606.

It is an arithmetic number, because the mean of its divisors is an integer number (2879121841776).

Almost surely, 2^{21110100001001} is an apocalyptic number.

It is an amenable number.

21110100001001 is a deficient number, since it is larger than the sum of its proper divisors (1922874733207).

21110100001001 is a wasteful number, since it uses less digits than its factorization.

21110100001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314561103.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21110100001001 its reverse (10010000101112), we get a palindrome (31120100102113).

The spelling of 21110100001001 in words is "twenty-one trillion, one hundred ten billion, one hundred million, one thousand, one".