21424102431 has 8 divisors (see below), whose sum is σ = 28569940224. Its totient is φ = 14280499800.

The previous prime is 21424102409. The next prime is 21424102439. The reversal of 21424102431 is 13420142412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21424102431 - 2²¹ = 21422005279 is a prime.

It is a super-2 number, since 2×21424102431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424102439) 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 in 7 ways as a sum of consecutive naturals, for example, 536295 + ... + 574856.

It is an arithmetic number, because the mean of its divisors is an integer number (3571242528).

Almost surely, 2^21424102431 is an apocalyptic number.

21424102431 is a deficient number, since it is larger than the sum of its proper divisors (7145837793).

21424102431 is a wasteful number, since it uses less digits than its factorization.

21424102431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117581.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21424102431 its reverse (13420142412), we get a palindrome (34844244843).

The spelling of 21424102431 in words is "twenty-one billion, four hundred twenty-four million, one hundred two thousand, four hundred thirty-one".