21122133187 has 2 divisors, whose sum is σ = 21122133188. Its totient is φ = 21122133186.

The previous prime is 21122133181. The next prime is 21122133211. The reversal of 21122133187 is 78133122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122133187 - 2²³ = 21113744579 is a prime.

It is a super-2 number, since 2×21122133187² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122133181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561066593 + 10561066594.

It is an arithmetic number, because the mean of its divisors is an integer number (10561066594).

Almost surely, 2^21122133187 is an apocalyptic number.

21122133187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122133187 is an equidigital number, since it uses as much as digits as its factorization.

21122133187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

Adding to 21122133187 its reverse (78133122112), we get a palindrome (99255255299).

The spelling of 21122133187 in words is "twenty-one billion, one hundred twenty-two million, one hundred thirty-three thousand, one hundred eighty-seven".