21434343123 has 8 divisors (see below), whose sum is σ = 29005678528. Its totient is φ = 14076284904.

The previous prime is 21434343097. The next prime is 21434343143. The reversal of 21434343123 is 32134343412.

It is a happy number.

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

It is not a de Polignac number, because 21434343123 - 2⁶ = 21434343059 is a prime.

It is a super-2 number, since 2×21434343123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434343143) 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, 53319061 + ... + 53319462.

It is an arithmetic number, because the mean of its divisors is an integer number (3625709816).

Almost surely, 2^21434343123 is an apocalyptic number.

21434343123 is a deficient number, since it is larger than the sum of its proper divisors (7571335405).

21434343123 is a wasteful number, since it uses less digits than its factorization.

21434343123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106638593.

The product of its digits is 20736, while the sum is 30.

Adding to 21434343123 its reverse (32134343412), we get a palindrome (53568686535).

The spelling of 21434343123 in words is "twenty-one billion, four hundred thirty-four million, three hundred forty-three thousand, one hundred twenty-three".