21515453424343 has 8 divisors (see below), whose sum is σ = 21569750931456. Its totient is φ = 21461201645400.

The previous prime is 21515453424341. The next prime is 21515453424349. The reversal of 21515453424343 is 34342435451512.

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 21515453424343 - 2¹ = 21515453424341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21515453424293 and 21515453424302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515453424341) 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, 10489743 + ... + 12371968.

It is an arithmetic number, because the mean of its divisors is an integer number (2696218866432).

Almost surely, 2^{21515453424343} is an apocalyptic number.

21515453424343 is a deficient number, since it is larger than the sum of its proper divisors (54297507113).

21515453424343 is a wasteful number, since it uses less digits than its factorization.

21515453424343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22864085.

The product of its digits is 3456000, while the sum is 46.

Adding to 21515453424343 its reverse (34342435451512), we get a palindrome (55857888875855).

The spelling of 21515453424343 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-three million, four hundred twenty-four thousand, three hundred forty-three".