10221881 has 4 divisors (see below), whose sum is σ = 10230912. Its totient is φ = 10212852.

The previous prime is 10221877. The next prime is 10221899. The reversal of 10221881 is 18812201.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18812201 = 109 ⋅172589.

It is a cyclic number.

It is not a de Polignac number, because 10221881 - 2² = 10221877 is a prime.

It is a super-2 number, since 2×10221881² = 208973702356322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10221481) 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, 2525 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (2557728).

Almost surely, 2^10221881 is an apocalyptic number.

It is an amenable number.

10221881 is a deficient number, since it is larger than the sum of its proper divisors (9031).

10221881 is an equidigital number, since it uses as much as digits as its factorization.

10221881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 10221881 is about 3197.1676527827. The cubic root of 10221881 is about 217.0252541980.

The spelling of 10221881 in words is "ten million, two hundred twenty-one thousand, eight hundred eighty-one".