21550722010 has 64 divisors (see below), whose sum is σ = 41767438752. Its totient is φ = 7976779776.

The previous prime is 21550722001. The next prime is 21550722023. The reversal of 21550722010 is 1022705512.

It can be written as a sum of positive squares in 16 ways, for example, as 4081548769 + 17469173241 = 63887^2 + 132171^2 .

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 31 ways as a sum of consecutive naturals, for example, 4179594 + ... + 4184746.

Almost surely, 2^21550722010 is an apocalyptic number.

21550722010 is a deficient number, since it is larger than the sum of its proper divisors (20216716742).

21550722010 is a wasteful number, since it uses less digits than its factorization.

21550722010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5587.

The product of its (nonzero) digits is 1400, while the sum is 25.

The spelling of 21550722010 in words is "twenty-one billion, five hundred fifty million, seven hundred twenty-two thousand, ten".