21220776170 has 16 divisors (see below), whose sum is σ = 41669887968. Its totient is φ = 7716645840.

The previous prime is 21220776139. The next prime is 21220776211. The reversal of 21220776170 is 7167702212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220776170.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96457964 + ... + 96458183.

It is an arithmetic number, because the mean of its divisors is an integer number (2604367998).

Almost surely, 2^21220776170 is an apocalyptic number.

21220776170 is a deficient number, since it is larger than the sum of its proper divisors (20449111798).

21220776170 is a wasteful number, since it uses less digits than its factorization.

21220776170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192916165.

The product of its (nonzero) digits is 16464, while the sum is 35.

The spelling of 21220776170 in words is "twenty-one billion, two hundred twenty million, seven hundred seventy-six thousand, one hundred seventy".