21520421501314 has 4 divisors (see below), whose sum is σ = 32280632251974. Its totient is φ = 10760210750656.

The previous prime is 21520421501291. The next prime is 21520421501399. The reversal of 21520421501314 is 41310512402512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21092204390625 + 428217110689 = 4592625^2 + 654383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380105375327 + ... + 5380105375330.

Almost surely, 2^{21520421501314} is an apocalyptic number.

21520421501314 is a deficient number, since it is larger than the sum of its proper divisors (10760210750660).

21520421501314 is a wasteful number, since it uses less digits than its factorization.

21520421501314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760210750659.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21520421501314 its reverse (41310512402512), we get a palindrome (62830933903826).

The spelling of 21520421501314 in words is "twenty-one trillion, five hundred twenty billion, four hundred twenty-one million, five hundred one thousand, three hundred fourteen".