21331332341345 has 16 divisors (see below), whose sum is σ = 27571332773712. Its totient is φ = 15749689697280.

The previous prime is 21331332341339. The next prime is 21331332341387. The reversal of 21331332341345 is 54314323313312.

It can be written as a sum of positive squares in 8 ways, for example, as 4058323062784 + 17273009278561 = 2014528^2 + 4156081^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21331332341345 is a prime.

It is a super-2 number, since 2×21331332341345² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21331332341299 and 21331332341308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27518972 + ... + 28283501.

It is an arithmetic number, because the mean of its divisors is an integer number (1723208298357).

Almost surely, 2^{21331332341345} is an apocalyptic number.

It is an amenable number.

21331332341345 is a deficient number, since it is larger than the sum of its proper divisors (6240000432367).

21331332341345 is a wasteful number, since it uses less digits than its factorization.

21331332341345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55808372.

The product of its digits is 233280, while the sum is 38.

Adding to 21331332341345 its reverse (54314323313312), we get a palindrome (75645655654657).

The spelling of 21331332341345 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred thirty-two million, three hundred forty-one thousand, three hundred forty-five".