21334420123 has 4 divisors (see below), whose sum is σ = 22457284360. Its totient is φ = 20211555888.

The previous prime is 21334420117. The next prime is 21334420157. The reversal of 21334420123 is 32102443312.

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 21334420123 - 2²¹ = 21332322971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21334420423) 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, 561432090 + ... + 561432127.

It is an arithmetic number, because the mean of its divisors is an integer number (5614321090).

Almost surely, 2^21334420123 is an apocalyptic number.

21334420123 is a deficient number, since it is larger than the sum of its proper divisors (1122864237).

21334420123 is a wasteful number, since it uses less digits than its factorization.

21334420123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122864236.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21334420123 its reverse (32102443312), we get a palindrome (53436863435).

The spelling of 21334420123 in words is "twenty-one billion, three hundred thirty-four million, four hundred twenty thousand, one hundred twenty-three".