21434123321 has 8 divisors (see below), whose sum is σ = 23123909760. Its totient is φ = 19750195152.

The previous prime is 21434123309. The next prime is 21434123357. The reversal of 21434123321 is 12332143412.

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 21434123321 - 2⁶ = 21434123257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434123371) 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, 1456961 + ... + 1471598.

It is an arithmetic number, because the mean of its divisors is an integer number (2890488720).

Almost surely, 2^21434123321 is an apocalyptic number.

It is an amenable number.

21434123321 is a deficient number, since it is larger than the sum of its proper divisors (1689786439).

21434123321 is a wasteful number, since it uses less digits than its factorization.

21434123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929135.

The product of its digits is 3456, while the sum is 26.

Adding to 21434123321 its reverse (12332143412), we get a palindrome (33766266733).

The spelling of 21434123321 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty-three thousand, three hundred twenty-one".