10231821 has 6 divisors (see below), whose sum is σ = 14779310. Its totient is φ = 6821208.

The previous prime is 10231817. The next prime is 10231831. The reversal of 10231821 is 12813201.

It can be written as a sum of positive squares in only one way, i.e., 10150596 + 81225 = 3186^2 + 285^2 .

It is not a de Polignac number, because 10231821 - 2² = 10231817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10231794 and 10231803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10231801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 568426 + ... + 568443.

Almost surely, 2^10231821 is an apocalyptic number.

It is an amenable number.

10231821 is a deficient number, since it is larger than the sum of its proper divisors (4547489).

10231821 is a wasteful number, since it uses less digits than its factorization.

10231821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136875 (or 1136872 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 10231821 is about 3198.7217759599. The cubic root of 10231821 is about 217.0955782462.

The spelling of 10231821 in words is "ten million, two hundred thirty-one thousand, eight hundred twenty-one".