21434111123 has 8 divisors (see below), whose sum is σ = 21841208928. Its totient is φ = 21027112704.

The previous prime is 21434111117. The next prime is 21434111129. The reversal of 21434111123 is 32111143412.

It is an interprime number because it is at equal distance from previous prime (21434111117) and next prime (21434111129).

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 21434111123 - 2²⁶ = 21367002259 is a prime.

It is a super-2 number, since 2×21434111123² (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 (21434111129) 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, 524786 + ... + 564152.

It is an arithmetic number, because the mean of its divisors is an integer number (2730151116).

Almost surely, 2^21434111123 is an apocalyptic number.

21434111123 is a deficient number, since it is larger than the sum of its proper divisors (407097805).

21434111123 is a wasteful number, since it uses less digits than its factorization.

21434111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49693.

The product of its digits is 576, while the sum is 23.

Adding to 21434111123 its reverse (32111143412), we get a palindrome (53545254535).

The spelling of 21434111123 in words is "twenty-one billion, four hundred thirty-four million, one hundred eleven thousand, one hundred twenty-three".