21001101201111 has 8 divisors (see below), whose sum is σ = 29648613460464. Its totient is φ = 13177161537920.

The previous prime is 21001101201061. The next prime is 21001101201121. The reversal of 21001101201111 is 11110210110012.

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 21001101201111 - 2³¹ = 20998953717463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001101201121) 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, 205893148980 + ... + 205893149081.

It is an arithmetic number, because the mean of its divisors is an integer number (3706076682558).

Almost surely, 2^{21001101201111} is an apocalyptic number.

21001101201111 is a deficient number, since it is larger than the sum of its proper divisors (8647512259353).

21001101201111 is a wasteful number, since it uses less digits than its factorization.

21001101201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411786298081.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21001101201111 its reverse (11110210110012), we get a palindrome (32111311311123).

The spelling of 21001101201111 in words is "twenty-one trillion, one billion, one hundred one million, two hundred one thousand, one hundred eleven".