10221212121 has 32 divisors (see below), whose sum is σ = 14339082240. Its totient is φ = 6463864704.

The previous prime is 10221212117. The next prime is 10221212143. The reversal of 10221212121 is 12121212201.

10221212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10221212121 - 2² = 10221212117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10221212121.

It is not an unprimeable number, because it can be changed into a prime (10221212161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7132021 + ... + 7133453.

It is an arithmetic number, because the mean of its divisors is an integer number (448096320).

Almost surely, 2^10221212121 is an apocalyptic number.

It is an amenable number.

10221212121 is a deficient number, since it is larger than the sum of its proper divisors (4117870119).

10221212121 is a wasteful number, since it uses less digits than its factorization.

10221212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245.

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

Adding to 10221212121 its reverse (12121212201), we get a palindrome (22342424322).

The spelling of 10221212121 in words is "ten billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".