10121222221 has 32 divisors (see below), whose sum is σ = 12030529536. Its totient is φ = 8411520000.

The previous prime is 10121222203. The next prime is 10121222257. The reversal of 10121222221 is 12222212101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10121222221 - 2¹⁵ = 10121189453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10121222195 and 10121222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121222261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 995956 + ... + 1006066.

It is an arithmetic number, because the mean of its divisors is an integer number (375954048).

Almost surely, 2^10121222221 is an apocalyptic number.

10121222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121222221 is a deficient number, since it is larger than the sum of its proper divisors (1909307315).

10121222221 is a wasteful number, since it uses less digits than its factorization.

10121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10121222221 its reverse (12222212101), we get a palindrome (22343434322).

The spelling of 10121222221 in words is "ten billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".