21210002221111 has 4 divisors (see below), whose sum is σ = 23138184241224. Its totient is φ = 19281820201000.

The previous prime is 21210002221103. The next prime is 21210002221117. The reversal of 21210002221111 is 11112220001212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210002221111 - 2³ = 21210002221103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210002221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964091010040 + ... + 964091010061.

It is an arithmetic number, because the mean of its divisors is an integer number (5784546060306).

Almost surely, 2^{21210002221111} is an apocalyptic number.

21210002221111 is a deficient number, since it is larger than the sum of its proper divisors (1928182020113).

21210002221111 is a wasteful number, since it uses less digits than its factorization.

21210002221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928182020112.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210002221111 its reverse (11112220001212), we get a palindrome (32322222222323).

The spelling of 21210002221111 in words is "twenty-one trillion, two hundred ten billion, two million, two hundred twenty-one thousand, one hundred eleven".