21122515151 has 2 divisors, whose sum is σ = 21122515152. Its totient is φ = 21122515150.

The previous prime is 21122515097. The next prime is 21122515153. The reversal of 21122515151 is 15151522112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122515151 - 2⁶ = 21122515087 is a prime.

Together with 21122515153, 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 21122515151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122515153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561257575 + 10561257576.

It is an arithmetic number, because the mean of its divisors is an integer number (10561257576).

Almost surely, 2^21122515151 is an apocalyptic number.

21122515151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122515151 is an equidigital number, since it uses as much as digits as its factorization.

21122515151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000, while the sum is 26.

The spelling of 21122515151 in words is "twenty-one billion, one hundred twenty-two million, five hundred fifteen thousand, one hundred fifty-one".