10231211221 has 48 divisors (see below), whose sum is σ = 13204012608. Its totient is φ = 7838208000.

The previous prime is 10231211197. The next prime is 10231211227. The reversal of 10231211221 is 12211213201.

It is not a de Polignac number, because 10231211221 - 2⁷ = 10231211093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10231211195 and 10231211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10231211227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8872981 + ... + 8874133.

It is an arithmetic number, because the mean of its divisors is an integer number (275083596).

Almost surely, 2^10231211221 is an apocalyptic number.

10231211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10231211221 is a deficient number, since it is larger than the sum of its proper divisors (2972801387).

10231211221 is a wasteful number, since it uses less digits than its factorization.

10231211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 10231211221 its reverse (12211213201), we get a palindrome (22442424422).

The spelling of 10231211221 in words is "ten billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty-one".