21520450422410 has 32 divisors (see below), whose sum is σ = 41466701995200. Its totient is φ = 8016895710720.

The previous prime is 21520450422403. The next prime is 21520450422421. The reversal of 21520450422410 is 1422405402512.

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, 959866151 + ... + 959888570.

It is an arithmetic number, because the mean of its divisors is an integer number (1295834437350).

Almost surely, 2^{21520450422410} is an apocalyptic number.

21520450422410 is a deficient number, since it is larger than the sum of its proper divisors (19946251572790).

21520450422410 is a wasteful number, since it uses less digits than its factorization.

21520450422410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919754806.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 21520450422410 its reverse (1422405402512), we get a palindrome (22942855824922).

The spelling of 21520450422410 in words is "twenty-one trillion, five hundred twenty billion, four hundred fifty million, four hundred twenty-two thousand, four hundred ten".