10021397 has 4 divisors (see below), whose sum is σ = 10066560. Its totient is φ = 9976236.

The previous prime is 10021393. The next prime is 10021411. The reversal of 10021397 is 79312001.

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.

It is a cyclic number.

It is not a de Polignac number, because 10021397 - 2² = 10021393 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 (10021393) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 22247 + ... + 22692.

It is an arithmetic number, because the mean of its divisors is an integer number (2516640).

Almost surely, 2^10021397 is an apocalyptic number.

It is an amenable number.

10021397 is a deficient number, since it is larger than the sum of its proper divisors (45163).

10021397 is an equidigital number, since it uses as much as digits as its factorization.

10021397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45162.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 10021397 is about 3165.6590151183. The cubic root of 10021397 is about 215.5970210003.

Adding to 10021397 its reverse (79312001), we get a palindrome (89333398).

The spelling of 10021397 in words is "ten million, twenty-one thousand, three hundred ninety-seven".