10121233221 has 24 divisors (see below), whose sum is σ = 15995987904. Its totient is φ = 6115858560.

The previous prime is 10121233217. The next prime is 10121233249. The reversal of 10121233221 is 12233212101.

10121233221 is a `hidden beast` number, since 101 + 212 + 332 + 21 = 666.

It is not a de Polignac number, because 10121233221 - 2² = 10121233217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10121233194 and 10121233203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121233201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118321 + ... + 185046.

It is an arithmetic number, because the mean of its divisors is an integer number (666499496).

Almost surely, 2^10121233221 is an apocalyptic number.

10121233221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121233221 is a deficient number, since it is larger than the sum of its proper divisors (5874754683).

10121233221 is a wasteful number, since it uses less digits than its factorization.

10121233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303721 (or 303718 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 10121233221 its reverse (12233212101), we get a palindrome (22354445322).

It can be divided in two parts, 10121 and 233221, that added together give a palindrome (243342).

The spelling of 10121233221 in words is "ten billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".