21003234024431 has 4 divisors (see below), whose sum is σ = 21003289365432. Its totient is φ = 21003178683432.

The previous prime is 21003234024407. The next prime is 21003234024457. The reversal of 21003234024431 is 13442043230012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003234024431 - 2²⁶ = 21003166915567 is a prime.

It is a super-2 number, since 2×21003234024431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003234024394 and 21003234024403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003234024401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27097256 + ... + 27861581.

It is an arithmetic number, because the mean of its divisors is an integer number (5250822341358).

Almost surely, 2^{21003234024431} is an apocalyptic number.

21003234024431 is a deficient number, since it is larger than the sum of its proper divisors (55341001).

21003234024431 is an equidigital number, since it uses as much as digits as its factorization.

21003234024431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55341000.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21003234024431 its reverse (13442043230012), we get a palindrome (34445277254443).

The spelling of 21003234024431 in words is "twenty-one trillion, three billion, two hundred thirty-four million, twenty-four thousand, four hundred thirty-one".