21014003431 has 4 divisors (see below), whose sum is σ = 21014338752. Its totient is φ = 21013668112.

The previous prime is 21014003419. The next prime is 21014003441. The reversal of 21014003431 is 13430041012.

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 21014003431 - 2¹¹ = 21014001383 is a prime.

It is a super-2 number, since 2×21014003431² (a number of 21 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 = 21014003399 and 21014003408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014003441) 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, 42526 + ... + 209371.

It is an arithmetic number, because the mean of its divisors is an integer number (5253584688).

Almost surely, 2^21014003431 is an apocalyptic number.

21014003431 is a deficient number, since it is larger than the sum of its proper divisors (335321).

21014003431 is an equidigital number, since it uses as much as digits as its factorization.

21014003431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335320.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21014003431 its reverse (13430041012), we get a palindrome (34444044443).

The spelling of 21014003431 in words is "twenty-one billion, fourteen million, three thousand, four hundred thirty-one".