21002210001111 has 4 divisors (see below), whose sum is σ = 28002946668152. Its totient is φ = 14001473334072.

The previous prime is 21002210001109. The next prime is 21002210001139. The reversal of 21002210001111 is 11110001220012.

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

It is not a de Polignac number, because 21002210001111 - 2¹ = 21002210001109 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 (21002210001811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500368333516 + ... + 3500368333521.

It is an arithmetic number, because the mean of its divisors is an integer number (7000736667038).

Almost surely, 2^{21002210001111} is an apocalyptic number.

21002210001111 is a deficient number, since it is larger than the sum of its proper divisors (7000736667041).

21002210001111 is an equidigital number, since it uses as much as digits as its factorization.

21002210001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000736667040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21002210001111 its reverse (11110001220012), we get a palindrome (32112211221123).

The spelling of 21002210001111 in words is "twenty-one trillion, two billion, two hundred ten million, one thousand, one hundred eleven".