10780021821 has 16 divisors (see below), whose sum is σ = 14445208448. Its totient is φ = 7150809600.

The previous prime is 10780021807. The next prime is 10780021829. The reversal of 10780021821 is 12812008701.

It is a happy number.

It is not a de Polignac number, because 10780021821 - 2²¹ = 10777924669 is a prime.

It is a super-2 number, since 2×10780021821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10780021829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949440 + ... + 960726.

It is an arithmetic number, because the mean of its divisors is an integer number (902825528).

Almost surely, 2^10780021821 is an apocalyptic number.

It is an amenable number.

10780021821 is a deficient number, since it is larger than the sum of its proper divisors (3665186627).

10780021821 is a wasteful number, since it uses less digits than its factorization.

10780021821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12852.

The product of its (nonzero) digits is 1792, while the sum is 30.

The spelling of 10780021821 in words is "ten billion, seven hundred eighty million, twenty-one thousand, eight hundred twenty-one".