21154005400067 has 2 divisors, whose sum is σ = 21154005400068. Its totient is φ = 21154005400066.

The previous prime is 21154005399929. The next prime is 21154005400069. The reversal of 21154005400067 is 76000450045112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154005400067 - 2²⁶ = 21153938291203 is a prime.

Together with 21154005400069, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21154005400069) 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, 10577002700033 + 10577002700034.

It is an arithmetic number, because the mean of its divisors is an integer number (10577002700034).

Almost surely, 2^{21154005400067} is an apocalyptic number.

21154005400067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154005400067 is an equidigital number, since it uses as much as digits as its factorization.

21154005400067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 21154005400067 its reverse (76000450045112), we get a palindrome (97154455445179).

The spelling of 21154005400067 in words is "twenty-one trillion, one hundred fifty-four billion, five million, four hundred thousand, sixty-seven".