21010220022111 has 4 divisors (see below), whose sum is σ = 28013626696152. Its totient is φ = 14006813348072.

The previous prime is 21010220022107. The next prime is 21010220022133. The reversal of 21010220022111 is 11122002201012.

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 21010220022111 - 2² = 21010220022107 is a prime.

It is a super-3 number, since 3×21010220022111³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010220022161) 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, 3501703337016 + ... + 3501703337021.

It is an arithmetic number, because the mean of its divisors is an integer number (7003406674038).

Almost surely, 2^{21010220022111} is an apocalyptic number.

21010220022111 is a deficient number, since it is larger than the sum of its proper divisors (7003406674041).

21010220022111 is an equidigital number, since it uses as much as digits as its factorization.

21010220022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003406674040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21010220022111 its reverse (11122002201012), we get a palindrome (32132222223123).

The spelling of 21010220022111 in words is "twenty-one trillion, ten billion, two hundred twenty million, twenty-two thousand, one hundred eleven".