10120821 has 8 divisors (see below), whose sum is σ = 13553280. Its totient is φ = 6717792.

The previous prime is 10120807. The next prime is 10120829. The reversal of 10120821 is 12802101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10120821 - 2⁹ = 10120309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10120821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6541 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (1694160).

Almost surely, 2^10120821 is an apocalyptic number.

It is an amenable number.

10120821 is a deficient number, since it is larger than the sum of its proper divisors (3432459).

10120821 is a wasteful number, since it uses less digits than its factorization.

10120821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14715.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 10120821 is about 3181.3237810698. The cubic root of 10120821 is about 216.3076676925.

Adding to 10120821 its reverse (12802101), we get a palindrome (22922922).

The spelling of 10120821 in words is "ten million, one hundred twenty thousand, eight hundred twenty-one".