10212220121 has 4 divisors (see below), whose sum is σ = 10214601012. Its totient is φ = 10209839232.

The previous prime is 10212220097. The next prime is 10212220141. The reversal of 10212220121 is 12102221201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4464912400 + 5747307721 = 66820^2 + 75811^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212220121 - 2¹⁰ = 10212219097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212220096 and 10212220105.

It is not an unprimeable number, because it can be changed into a prime (10212220141) 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, 1184000 + ... + 1192593.

It is an arithmetic number, because the mean of its divisors is an integer number (2553650253).

Almost surely, 2^10212220121 is an apocalyptic number.

It is an amenable number.

10212220121 is a deficient number, since it is larger than the sum of its proper divisors (2380891).

10212220121 is an equidigital number, since it uses as much as digits as its factorization.

10212220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380890.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10212220121 its reverse (12102221201), we get a palindrome (22314441322).

The spelling of 10212220121 in words is "ten billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".