21450040351 has 8 divisors (see below), whose sum is σ = 21495017984. Its totient is φ = 21405095640.

The previous prime is 21450040333. The next prime is 21450040387. The reversal of 21450040351 is 15304005412.

It is a happy number.

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 21450040351 - 2⁵ = 21450040319 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 (21450040301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1621996 + ... + 1635166.

It is an arithmetic number, because the mean of its divisors is an integer number (2686877248).

Almost surely, 2^21450040351 is an apocalyptic number.

21450040351 is a deficient number, since it is larger than the sum of its proper divisors (44977633).

21450040351 is a wasteful number, since it uses less digits than its factorization.

21450040351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16461.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21450040351 its reverse (15304005412), we get a palindrome (36754045763).

The spelling of 21450040351 in words is "twenty-one billion, four hundred fifty million, forty thousand, three hundred fifty-one".