21624155290487 has 2 divisors, whose sum is σ = 21624155290488. Its totient is φ = 21624155290486.

The previous prime is 21624155290481. The next prime is 21624155290489. The reversal of 21624155290487 is 78409255142612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21624155290487 - 2¹⁶ = 21624155224951 is a prime.

It is a super-2 number, since 2×21624155290487² (a number of 27 digits) contains 22 as substring.

Together with 21624155290489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21624155290481) 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, 10812077645243 + 10812077645244.

It is an arithmetic number, because the mean of its divisors is an integer number (10812077645244).

Almost surely, 2^{21624155290487} is an apocalyptic number.

21624155290487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21624155290487 is an equidigital number, since it uses as much as digits as its factorization.

21624155290487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 21624155290487 in words is "twenty-one trillion, six hundred twenty-four billion, one hundred fifty-five million, two hundred ninety thousand, four hundred eighty-seven".