21111210001101 has 64 divisors (see below), whose sum is σ = 32014524174336. Its totient is φ = 12260793484800.

The previous prime is 21111210001073. The next prime is 21111210001153. The reversal of 21111210001101 is 10110001211112.

It is not a de Polignac number, because 21111210001101 - 2¹⁰ = 21111210000077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111210001001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83704281 + ... + 83956113.

It is an arithmetic number, because the mean of its divisors is an integer number (500226940224).

Almost surely, 2^{21111210001101} is an apocalyptic number.

It is an amenable number.

21111210001101 is a deficient number, since it is larger than the sum of its proper divisors (10903314173235).

21111210001101 is a wasteful number, since it uses less digits than its factorization.

21111210001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252922.

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

Adding to 21111210001101 its reverse (10110001211112), we get a palindrome (31221211212213).

The spelling of 21111210001101 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, one thousand, one hundred one".