21520544214 has 16 divisors (see below), whose sum is σ = 46351941552. Its totient is φ = 6621705888.

The previous prime is 21520544209. The next prime is 21520544249. The reversal of 21520544214 is 41244502512.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137952129 + ... + 137952284.

It is an arithmetic number, because the mean of its divisors is an integer number (2896996347).

Almost surely, 2^21520544214 is an apocalyptic number.

21520544214 is an abundant number, since it is smaller than the sum of its proper divisors (24831397338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21520544214 is a wasteful number, since it uses less digits than its factorization.

21520544214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275904431.

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 21520544214 in words is "twenty-one billion, five hundred twenty million, five hundred forty-four thousand, two hundred fourteen".