10221717780 has 96 divisors (see below), whose sum is σ = 32043876480. Its totient is φ = 2704965120.

The previous prime is 10221717773. The next prime is 10221717829. The reversal of 10221717780 is 8771712201.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1509 + ... + 142988.

It is an arithmetic number, because the mean of its divisors is an integer number (333790380).

Almost surely, 2^10221717780 is an apocalyptic number.

10221717780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10221717780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16021938240).

10221717780 is an abundant number, since it is smaller than the sum of its proper divisors (21822158700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10221717780 is a wasteful number, since it uses less digits than its factorization.

10221717780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144646 (or 144638 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 36.

The spelling of 10221717780 in words is "ten billion, two hundred twenty-one million, seven hundred seventeen thousand, seven hundred eighty".