21012220111151 has 2 divisors, whose sum is σ = 21012220111152. Its totient is φ = 21012220111150.

The previous prime is 21012220111007. The next prime is 21012220111219. The reversal of 21012220111151 is 15111102221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012220111151 - 2²⁶ = 21012153002287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012220110151) 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 as a sum of consecutive naturals, namely, 10506110055575 + 10506110055576.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110055576).

Almost surely, 2^{21012220111151} is an apocalyptic number.

21012220111151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012220111151 is an equidigital number, since it uses as much as digits as its factorization.

21012220111151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 20.

Adding to 21012220111151 its reverse (15111102221012), we get a palindrome (36123322332163).

The spelling of 21012220111151 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred eleven thousand, one hundred fifty-one".