21004141431 has 64 divisors (see below), whose sum is σ = 35759001600. Its totient is φ = 10666446336.

The previous prime is 21004141391. The next prime is 21004141441. The reversal of 21004141431 is 13414140012.

It is not a de Polignac number, because 21004141431 - 2⁷ = 21004141303 is a prime.

It is a super-2 number, since 2×21004141431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21004141398 and 21004141407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004141441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2901925 + ... + 2909153.

It is an arithmetic number, because the mean of its divisors is an integer number (558734400).

Almost surely, 2^21004141431 is an apocalyptic number.

21004141431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21004141431 is a deficient number, since it is larger than the sum of its proper divisors (14754860169).

21004141431 is a wasteful number, since it uses less digits than its factorization.

21004141431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7648.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21004141431 its reverse (13414140012), we get a palindrome (34418281443).

The spelling of 21004141431 in words is "twenty-one billion, four million, one hundred forty-one thousand, four hundred thirty-one".