21344423402 has 8 divisors (see below), whose sum is σ = 32268734976. Its totient is φ = 10588178412.

The previous prime is 21344423339. The next prime is 21344423411. The reversal of 21344423402 is 20432444312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42016328 + ... + 42016835.

It is an arithmetic number, because the mean of its divisors is an integer number (4033591872).

Almost surely, 2^21344423402 is an apocalyptic number.

21344423402 is a deficient number, since it is larger than the sum of its proper divisors (10924311574).

21344423402 is a wasteful number, since it uses less digits than its factorization.

21344423402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84033292.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21344423402 its reverse (20432444312), we get a palindrome (41776867714).

The spelling of 21344423402 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-three thousand, four hundred two".