10121222221111 has 4 divisors (see below), whose sum is σ = 10156986257512. Its totient is φ = 10085458184712.

The previous prime is 10121222221073. The next prime is 10121222221169. The reversal of 10121222221111 is 11112222212101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10121222221111 - 2¹⁷ = 10121222090039 is a prime.

It is a super-2 number, since 2×10121222221111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121222221181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17882017776 + ... + 17882018341.

It is an arithmetic number, because the mean of its divisors is an integer number (2539246564378).

Almost surely, 2^{10121222221111} is an apocalyptic number.

10121222221111 is a deficient number, since it is larger than the sum of its proper divisors (35764036401).

10121222221111 is an equidigital number, since it uses as much as digits as its factorization.

10121222221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35764036400.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 10121222221111 its reverse (11112222212101), we get a palindrome (21233444433212).

The spelling of 10121222221111 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".