21220002111111 has 8 divisors (see below), whose sum is σ = 28293485850864. Its totient is φ = 14146593222720.

The previous prime is 21220002111109. The next prime is 21220002111137. The reversal of 21220002111111 is 11111120002212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220002111111 - 2¹ = 21220002111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220002111101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18047976 + ... + 19187741.

It is an arithmetic number, because the mean of its divisors is an integer number (3536685731358).

Almost surely, 2^{21220002111111} is an apocalyptic number.

21220002111111 is a deficient number, since it is larger than the sum of its proper divisors (7073483739753).

21220002111111 is a wasteful number, since it uses less digits than its factorization.

21220002111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37425681.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21220002111111 its reverse (11111120002212), we get a palindrome (32331122113323).

The spelling of 21220002111111 in words is "twenty-one trillion, two hundred twenty billion, two million, one hundred eleven thousand, one hundred eleven".