21323135413550 has 48 divisors (see below), whose sum is σ = 42091468420032. Its totient is φ = 8008907827200.

The previous prime is 21323135413519. The next prime is 21323135413577. The reversal of 21323135413550 is 5531453132312.

It is a super-2 number, since 2×21323135413550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28735787 + ... + 29468486.

It is an arithmetic number, because the mean of its divisors is an integer number (876905592084).

Almost surely, 2^{21323135413550} is an apocalyptic number.

21323135413550 is a deficient number, since it is larger than the sum of its proper divisors (20768333006482).

21323135413550 is a wasteful number, since it uses less digits than its factorization.

21323135413550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58204733 (or 58204728 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 21323135413550 its reverse (5531453132312), we get a palindrome (26854588545862).

The spelling of 21323135413550 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred thirty-five million, four hundred thirteen thousand, five hundred fifty".