21450014232431 has 4 divisors (see below), whose sum is σ = 21650481655272. Its totient is φ = 21249546809592.

The previous prime is 21450014232371. The next prime is 21450014232463. The reversal of 21450014232431 is 13423241005412.

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 21450014232431 - 2²⁶ = 21449947123567 is a prime.

It is a super-2 number, since 2×21450014232431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450014232331) 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, 100233711260 + ... + 100233711473.

It is an arithmetic number, because the mean of its divisors is an integer number (5412620413818).

Almost surely, 2^{21450014232431} is an apocalyptic number.

21450014232431 is a deficient number, since it is larger than the sum of its proper divisors (200467422841).

21450014232431 is a wasteful number, since it uses less digits than its factorization.

21450014232431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200467422840.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21450014232431 its reverse (13423241005412), we get a palindrome (34873255237843).

The spelling of 21450014232431 in words is "twenty-one trillion, four hundred fifty billion, fourteen million, two hundred thirty-two thousand, four hundred thirty-one".