21217359050 has 12 divisors (see below), whose sum is σ = 39464287926. Its totient is φ = 8486943600.

The previous prime is 21217359029. The next prime is 21217359073. The reversal of 21217359050 is 5095371212.

It can be written as a sum of positive squares in 3 ways, for example, as 20089944121 + 1127414929 = 141739^2 + 33577^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21217359050.

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 5 ways as a sum of consecutive naturals, for example, 212173541 + ... + 212173640.

Almost surely, 2^21217359050 is an apocalyptic number.

21217359050 is a deficient number, since it is larger than the sum of its proper divisors (18246928876).

21217359050 is a wasteful number, since it uses less digits than its factorization.

21217359050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424347193 (or 424347188 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 21217359050 in words is "twenty-one billion, two hundred seventeen million, three hundred fifty-nine thousand, fifty".