10121212221 has 16 divisors (see below), whose sum is σ = 13537456128. Its totient is φ = 6726249200.

The previous prime is 10121212219. The next prime is 10121212243. The reversal of 10121212221 is 12221212101.

It is a cyclic number.

It is not a de Polignac number, because 10121212221 - 2¹ = 10121212219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10121212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121214221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2075416 + ... + 2080286.

It is an arithmetic number, because the mean of its divisors is an integer number (846091008).

Almost surely, 2^10121212221 is an apocalyptic number.

It is an amenable number.

10121212221 is a deficient number, since it is larger than the sum of its proper divisors (3416243907).

10121212221 is a wasteful number, since it uses less digits than its factorization.

10121212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 10121212221 its reverse (12221212101), we get a palindrome (22342424322).

The spelling of 10121212221 in words is "ten billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".