10221390 has 40 divisors (see below), whose sum is σ = 27486360. Its totient is φ = 2725488.

The previous prime is 10221377. The next prime is 10221391. The reversal of 10221390 is 9312201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221391) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5500 + ... + 7119.

It is an arithmetic number, because the mean of its divisors is an integer number (687159).

Almost surely, 2^10221390 is an apocalyptic number.

10221390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10221390 is an abundant number, since it is smaller than the sum of its proper divisors (17264970).

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

10221390 is a wasteful number, since it uses less digits than its factorization.

10221390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12638 (or 12629 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 10221390 is about 3197.0908651460. The cubic root of 10221390 is about 217.0217792634.

Adding to 10221390 its reverse (9312201), we get a palindrome (19533591).

The spelling of 10221390 in words is "ten million, two hundred twenty-one thousand, three hundred ninety".