10780221 has 4 divisors (see below), whose sum is σ = 14373632. Its totient is φ = 7186812.

The previous prime is 10780213. The next prime is 10780223. The reversal of 10780221 is 12208701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12208701 = 3 ⋅4069567.

It is not a de Polignac number, because 10780221 - 2³ = 10780213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10780223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796701 + ... + 1796706.

It is an arithmetic number, because the mean of its divisors is an integer number (3593408).

Almost surely, 2^10780221 is an apocalyptic number.

It is an amenable number.

10780221 is a deficient number, since it is larger than the sum of its proper divisors (3593411).

10780221 is an equidigital number, since it uses as much as digits as its factorization.

10780221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593410.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 10780221 is about 3283.3246869599. The cubic root of 10780221 is about 220.9068695729.

Adding to 10780221 its reverse (12208701), we get a palindrome (22988922).

The spelling of 10780221 in words is "ten million, seven hundred eighty thousand, two hundred twenty-one".