21445463622787 has 2 divisors, whose sum is σ = 21445463622788. Its totient is φ = 21445463622786.

The previous prime is 21445463622767. The next prime is 21445463622799. The reversal of 21445463622787 is 78722636454412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21445463622787 - 2¹¹ = 21445463620739 is a prime.

It is not a weakly prime, because it can be changed into another prime (21445463622767) 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, 10722731811393 + 10722731811394.

It is an arithmetic number, because the mean of its divisors is an integer number (10722731811394).

Almost surely, 2^{21445463622787} is an apocalyptic number.

21445463622787 is a deficient number, since it is larger than the sum of its proper divisors (1).

21445463622787 is an equidigital number, since it uses as much as digits as its factorization.

21445463622787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108380160, while the sum is 61.

The spelling of 21445463622787 in words is "twenty-one trillion, four hundred forty-five billion, four hundred sixty-three million, six hundred twenty-two thousand, seven hundred eighty-seven".