21010112011001 has 4 divisors (see below), whose sum is σ = 21734598632100. Its totient is φ = 20285625389904.

The previous prime is 21010112010997. The next prime is 21010112011003. The reversal of 21010112011001 is 10011021101012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14459378897401 + 6550733113600 = 3802549^2 + 2559440^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010112011001 - 2² = 21010112010997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010112011003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362243310506 + ... + 362243310563.

It is an arithmetic number, because the mean of its divisors is an integer number (5433649658025).

Almost surely, 2^{21010112011001} is an apocalyptic number.

It is an amenable number.

21010112011001 is a deficient number, since it is larger than the sum of its proper divisors (724486621099).

21010112011001 is an equidigital number, since it uses as much as digits as its factorization.

21010112011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724486621098.

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

Adding to 21010112011001 its reverse (10011021101012), we get a palindrome (31021133112013).

The spelling of 21010112011001 in words is "twenty-one trillion, ten billion, one hundred twelve million, eleven thousand, one".