21423945351 has 8 divisors (see below), whose sum is σ = 28668385264. Its totient is φ = 14231067840.

The previous prime is 21423945271. The next prime is 21423945397. The reversal of 21423945351 is 15354932412.

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

It is not a de Polignac number, because 21423945351 - 2⁷ = 21423945223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423941351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12889630 + ... + 12891291.

It is an arithmetic number, because the mean of its divisors is an integer number (3583548158).

Almost surely, 2^21423945351 is an apocalyptic number.

21423945351 is a deficient number, since it is larger than the sum of its proper divisors (7244439913).

21423945351 is a wasteful number, since it uses less digits than its factorization.

21423945351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25781201.

The product of its digits is 129600, while the sum is 39.

It can be divided in two parts, 2142 and 3945351, that added together give a palindrome (3947493).

The spelling of 21423945351 in words is "twenty-one billion, four hundred twenty-three million, nine hundred forty-five thousand, three hundred fifty-one".