21001002001111 has 8 divisors (see below), whose sum is σ = 22920785685648. Its totient is φ = 19082985264000.

The previous prime is 21001002001099. The next prime is 21001002001163. The reversal of 21001002001111 is 11110020010012.

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 21001002001111 - 2⁹ = 21001002000599 is a prime.

It is a super-3 number, since 3×21001002001111³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001002001411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441712000 + ... + 441759541.

It is an arithmetic number, because the mean of its divisors is an integer number (2865098210706).

Almost surely, 2^{21001002001111} is an apocalyptic number.

21001002001111 is a deficient number, since it is larger than the sum of its proper divisors (1919783684537).

21001002001111 is a wasteful number, since it uses less digits than its factorization.

21001002001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883473713.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001002001111 its reverse (11110020010012), we get a palindrome (32111022011123).

The spelling of 21001002001111 in words is "twenty-one trillion, one billion, two million, one thousand, one hundred eleven".