10120021 has 2 divisors, whose sum is σ = 10120022. Its totient is φ = 10120020.

The previous prime is 10119983. The next prime is 10120039. The reversal of 10120021 is 12002101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8584900 + 1535121 = 2930^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120021 - 2¹⁷ = 9988949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10119986 and 10120013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10120081) 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 as a sum of consecutive naturals, namely, 5060010 + 5060011.

It is an arithmetic number, because the mean of its divisors is an integer number (5060011).

Almost surely, 2^10120021 is an apocalyptic number.

It is an amenable number.

10120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10120021 is an equidigital number, since it uses as much as digits as its factorization.

10120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 10120021 is about 3181.1980447624. The cubic root of 10120021 is about 216.3019681979.

Adding to 10120021 its reverse (12002101), we get a palindrome (22122122).

The spelling of 10120021 in words is "ten million, one hundred twenty thousand, twenty-one".