21520553050 has 24 divisors (see below), whose sum is σ = 40036081500. Its totient is φ = 8606532480.

The previous prime is 21520552973. The next prime is 21520553101. The reversal of 21520553050 is 5035502512.

It can be written as a sum of positive squares in 6 ways, for example, as 6845411169 + 14675141881 = 82737^2 + 121141^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232956 + ... + 311944.

Almost surely, 2^21520553050 is an apocalyptic number.

21520553050 is a deficient number, since it is larger than the sum of its proper divisors (18515528450).

21520553050 is a wasteful number, since it uses less digits than its factorization.

21520553050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84450 (or 84445 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The spelling of 21520553050 in words is "twenty-one billion, five hundred twenty million, five hundred fifty-three thousand, fifty".