21014340431 has 8 divisors (see below), whose sum is σ = 24020540544. Its totient is φ = 18009178200.

The previous prime is 21014340427. The next prime is 21014340443. The reversal of 21014340431 is 13404341012.

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

It is a cyclic number.

It is not a de Polignac number, because 21014340431 - 2² = 21014340427 is a prime.

It is a super-2 number, since 2×21014340431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21014340397 and 21014340406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014340401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215585 + ... + 297498.

It is an arithmetic number, because the mean of its divisors is an integer number (3002567568).

Almost surely, 2^21014340431 is an apocalyptic number.

21014340431 is a deficient number, since it is larger than the sum of its proper divisors (3006200113).

21014340431 is an equidigital number, since it uses as much as digits as its factorization.

21014340431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518941.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21014340431 its reverse (13404341012), we get a palindrome (34418681443).

The spelling of 21014340431 in words is "twenty-one billion, fourteen million, three hundred forty thousand, four hundred thirty-one".