21616652770 has 16 divisors (see below), whose sum is σ = 41198797368. Its totient is φ = 8138033920.

The previous prime is 21616652767. The next prime is 21616652839. The reversal of 21616652770 is 7725661612.

It can be written as a sum of positive squares in 4 ways, for example, as 19152622449 + 2464030321 = 138393^2 + 49639^2 .

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 7 ways as a sum of consecutive naturals, for example, 63578221 + ... + 63578560.

Almost surely, 2^21616652770 is an apocalyptic number.

21616652770 is a deficient number, since it is larger than the sum of its proper divisors (19582144598).

21616652770 is a wasteful number, since it uses less digits than its factorization.

21616652770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127156805.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 21616652770 in words is "twenty-one billion, six hundred sixteen million, six hundred fifty-two thousand, seven hundred seventy".