21325415353 has 16 divisors (see below), whose sum is σ = 23733570240. Its totient is φ = 18997876800.

The previous prime is 21325415351. The next prime is 21325415369. The reversal of 21325415353 is 35351452312.

It is a cyclic number.

It is not a de Polignac number, because 21325415353 - 2¹ = 21325415351 is a prime.

It is a super-2 number, since 2×21325415353² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21325415351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121426 + ... + 239572.

It is an arithmetic number, because the mean of its divisors is an integer number (1483348140).

Almost surely, 2^21325415353 is an apocalyptic number.

It is an amenable number.

21325415353 is a deficient number, since it is larger than the sum of its proper divisors (2408154887).

21325415353 is a wasteful number, since it uses less digits than its factorization.

21325415353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118488.

The product of its digits is 54000, while the sum is 34.

Adding to 21325415353 its reverse (35351452312), we get a palindrome (56676867665).

The spelling of 21325415353 in words is "twenty-one billion, three hundred twenty-five million, four hundred fifteen thousand, three hundred fifty-three".