21001102111001 has 8 divisors (see below), whose sum is σ = 21033476587200. Its totient is φ = 20968729170480.

The previous prime is 21001102110991. The next prime is 21001102111009. The reversal of 21001102111001 is 10011120110012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001102111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001102111009) 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, 28681235 + ... + 29404343.

It is an arithmetic number, because the mean of its divisors is an integer number (2629184573400).

Almost surely, 2^{21001102111001} is an apocalyptic number.

It is an amenable number.

21001102111001 is a deficient number, since it is larger than the sum of its proper divisors (32374476199).

21001102111001 is an equidigital number, since it uses as much as digits as its factorization.

21001102111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767839.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21001102111001 its reverse (10011120110012), we get a palindrome (31012222221013).

The spelling of 21001102111001 in words is "twenty-one trillion, one billion, one hundred two million, one hundred eleven thousand, one".