21122515153 has 2 divisors, whose sum is σ = 21122515154. Its totient is φ = 21122515152.

The previous prime is 21122515151. The next prime is 21122515163. The reversal of 21122515153 is 35151522112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20238761169 + 883753984 = 142263^2 + 29728^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122515153 - 2¹ = 21122515151 is a prime.

It is a super-2 number, since 2×21122515153² (a number of 21 digits) contains 22 as substring.

Together with 21122515151, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21122515151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561257576 + 10561257577.

It is an arithmetic number, because the mean of its divisors is an integer number (10561257577).

Almost surely, 2^21122515153 is an apocalyptic number.

It is an amenable number.

21122515153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122515153 is an equidigital number, since it uses as much as digits as its factorization.

21122515153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 28.

The spelling of 21122515153 in words is "twenty-one billion, one hundred twenty-two million, five hundred fifteen thousand, one hundred fifty-three".