21111001100211 has 64 divisors (see below), whose sum is σ = 31640193847296. Its totient is φ = 12408008457600.

The previous prime is 21111001100207. The next prime is 21111001100239. The reversal of 21111001100211 is 11200110011112.

It is not a de Polignac number, because 21111001100211 - 2² = 21111001100207 is a prime.

It is a super-2 number, since 2×21111001100211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111001100251) 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, 493376160 + ... + 493418946.

It is an arithmetic number, because the mean of its divisors is an integer number (494378028864).

Almost surely, 2^{21111001100211} is an apocalyptic number.

21111001100211 is a deficient number, since it is larger than the sum of its proper divisors (10529192747085).

21111001100211 is a wasteful number, since it uses less digits than its factorization.

21111001100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44152.

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

Adding to 21111001100211 its reverse (11200110011112), we get a palindrome (32311111111323).

It can be divided in two parts, 21111001 and 100211, that added together give a palindrome (21211212).

The spelling of 21111001100211 in words is "twenty-one trillion, one hundred eleven billion, one million, one hundred thousand, two hundred eleven".