21210001101111 has 16 divisors (see below), whose sum is σ = 29073872600064. Its totient is φ = 13743842714784.

The previous prime is 21210001101083. The next prime is 21210001101119. The reversal of 21210001101111 is 11110110001212.

It is not a de Polignac number, because 21210001101111 - 2¹³ = 21210001092919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210001101119) 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, 97083711 + ... + 97301936.

It is an arithmetic number, because the mean of its divisors is an integer number (1817117037504).

Almost surely, 2^{21210001101111} is an apocalyptic number.

21210001101111 is a deficient number, since it is larger than the sum of its proper divisors (7863871498953).

21210001101111 is a wasteful number, since it uses less digits than its factorization.

21210001101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194386670.

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

Adding to 21210001101111 its reverse (11110110001212), we get a palindrome (32320111102323).

It can be divided in two parts, 21210001101 and 111, that added together give a palindrome (21210001212).

The spelling of 21210001101111 in words is "twenty-one trillion, two hundred ten billion, one million, one hundred one thousand, one hundred eleven".