21520450014034 has 4 divisors (see below), whose sum is σ = 32280675021054. Its totient is φ = 10760225007016.

The previous prime is 21520450014029. The next prime is 21520450014059. The reversal of 21520450014034 is 43041005402512.

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., 21006153063009 + 514296951025 = 4583247^2 + 717145^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21520450013987 and 21520450014005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380112503507 + ... + 5380112503510.

Almost surely, 2^{21520450014034} is an apocalyptic number.

21520450014034 is a deficient number, since it is larger than the sum of its proper divisors (10760225007020).

21520450014034 is a wasteful number, since it uses less digits than its factorization.

21520450014034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760225007019.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21520450014034 its reverse (43041005402512), we get a palindrome (64561455416546).

The spelling of 21520450014034 in words is "twenty-one trillion, five hundred twenty billion, four hundred fifty million, fourteen thousand, thirty-four".