21220300031111 has 2 divisors, whose sum is σ = 21220300031112. Its totient is φ = 21220300031110.

The previous prime is 21220300031023. The next prime is 21220300031113. The reversal of 21220300031111 is 11113000302212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220300031111 - 2²² = 21220295836807 is a prime.

It is a super-2 number, since 2×21220300031111² (a number of 27 digits) contains 22 as substring.

Together with 21220300031113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220300031111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220300031113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610150015555 + 10610150015556.

It is an arithmetic number, because the mean of its divisors is an integer number (10610150015556).

Almost surely, 2^{21220300031111} is an apocalyptic number.

21220300031111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220300031111 is an equidigital number, since it uses as much as digits as its factorization.

21220300031111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21220300031111 its reverse (11113000302212), we get a palindrome (32333300333323).

The spelling of 21220300031111 in words is "twenty-one trillion, two hundred twenty billion, three hundred million, thirty-one thousand, one hundred eleven".