21423424683487 has 2 divisors, whose sum is σ = 21423424683488. Its totient is φ = 21423424683486.

The previous prime is 21423424683467. The next prime is 21423424683517. The reversal of 21423424683487 is 78438642432412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423424683487 is a prime.

It is a super-2 number, since 2×21423424683487² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423424683457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711712341743 + 10711712341744.

It is an arithmetic number, because the mean of its divisors is an integer number (10711712341744).

Almost surely, 2^{21423424683487} is an apocalyptic number.

21423424683487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423424683487 is an equidigital number, since it uses as much as digits as its factorization.

21423424683487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49545216, while the sum is 58.

The spelling of 21423424683487 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, six hundred eighty-three thousand, four hundred eighty-seven".