21110001111211 has 16 divisors (see below), whose sum is σ = 22254985986048. Its totient is φ = 19994032130400.

The previous prime is 21110001111193. The next prime is 21110001111239. The reversal of 21110001111211 is 11211110001112.

It is not a de Polignac number, because 21110001111211 - 2⁹ = 21110001110699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110001111191 and 21110001111200.

It is not an unprimeable number, because it can be changed into a prime (21110001111611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139491861 + ... + 139643113.

It is an arithmetic number, because the mean of its divisors is an integer number (1390936624128).

Almost surely, 2^{21110001111211} is an apocalyptic number.

21110001111211 is a deficient number, since it is larger than the sum of its proper divisors (1144984874837).

21110001111211 is a wasteful number, since it uses less digits than its factorization.

21110001111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247122.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21110001111211 its reverse (11211110001112), we get a palindrome (32321111112323).

The spelling of 21110001111211 in words is "twenty-one trillion, one hundred ten billion, one million, one hundred eleven thousand, two hundred eleven".