21154133167 has 2 divisors, whose sum is σ = 21154133168. Its totient is φ = 21154133166.

The previous prime is 21154133131. The next prime is 21154133171. The reversal of 21154133167 is 76133145112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154133167 - 2²⁷ = 21019915439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154133267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577066583 + 10577066584.

It is an arithmetic number, because the mean of its divisors is an integer number (10577066584).

Almost surely, 2^21154133167 is an apocalyptic number.

21154133167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154133167 is an equidigital number, since it uses as much as digits as its factorization.

21154133167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

Adding to 21154133167 its reverse (76133145112), we get a palindrome (97287278279).

The spelling of 21154133167 in words is "twenty-one billion, one hundred fifty-four million, one hundred thirty-three thousand, one hundred sixty-seven".