21424701687 has 16 divisors (see below), whose sum is σ = 29851484928. Its totient is φ = 13642326720.

The previous prime is 21424701677. The next prime is 21424701703. The reversal of 21424701687 is 78610742412.

It is not a de Polignac number, because 21424701687 - 2¹⁰ = 21424700663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424701677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176998 + ... + 272355.

It is an arithmetic number, because the mean of its divisors is an integer number (1865717808).

Almost surely, 2^21424701687 is an apocalyptic number.

21424701687 is a deficient number, since it is larger than the sum of its proper divisors (8426783241).

21424701687 is a wasteful number, since it uses less digits than its factorization.

21424701687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450070.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 21424701687 in words is "twenty-one billion, four hundred twenty-four million, seven hundred one thousand, six hundred eighty-seven".