21111021100001 has 8 divisors (see below), whose sum is σ = 24182860103424. Its totient is φ = 18053176808160.

The previous prime is 21111021099997. The next prime is 21111021100021. The reversal of 21111021100001 is 10000112011112.

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 21111021100001 - 2² = 21111021099997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111021100021) 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, 3498674660 + ... + 3498680693.

It is an arithmetic number, because the mean of its divisors is an integer number (3022857512928).

Almost surely, 2^{21111021100001} is an apocalyptic number.

It is an amenable number.

21111021100001 is a deficient number, since it is larger than the sum of its proper divisors (3071839003423).

21111021100001 is an equidigital number, since it uses as much as digits as its factorization.

21111021100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997355791.

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

Adding to 21111021100001 its reverse (10000112011112), we get a palindrome (31111133111113).

The spelling of 21111021100001 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, one hundred thousand, one".