21434244231 has 8 divisors (see below), whose sum is σ = 29005544704. Its totient is φ = 14076219960.

The previous prime is 21434244217. The next prime is 21434244241. The reversal of 21434244231 is 13244243412.

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

It is not a de Polignac number, because 21434244231 - 2²⁶ = 21367135367 is a prime.

It is a super-2 number, since 2×21434244231² (a number of 21 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 (21434244241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53318815 + ... + 53319216.

It is an arithmetic number, because the mean of its divisors is an integer number (3625693088).

Almost surely, 2^21434244231 is an apocalyptic number.

21434244231 is a deficient number, since it is larger than the sum of its proper divisors (7571300473).

21434244231 is a wasteful number, since it uses less digits than its factorization.

21434244231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106638101.

The product of its digits is 18432, while the sum is 30.

Adding to 21434244231 its reverse (13244243412), we get a palindrome (34678487643).

The spelling of 21434244231 in words is "twenty-one billion, four hundred thirty-four million, two hundred forty-four thousand, two hundred thirty-one".