101211121221 has 16 divisors (see below), whose sum is σ = 154257667200. Its totient is φ = 57823227648.

The previous prime is 101211121199. The next prime is 101211121229. The reversal of 101211121221 is 122121112101.

It is a happy number.

It is not a de Polignac number, because 101211121221 - 2⁶ = 101211121157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101211121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211121229) 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 15 ways as a sum of consecutive naturals, for example, 380616 + ... + 589313.

It is an arithmetic number, because the mean of its divisors is an integer number (9641104200).

Almost surely, 2^101211121221 is an apocalyptic number.

It is an amenable number.

101211121221 is a deficient number, since it is larger than the sum of its proper divisors (53046545979).

101211121221 is an equidigital number, since it uses as much as digits as its factorization.

101211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974908.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 101211121221 its reverse (122121112101), we get a palindrome (223332233322).

The spelling of 101211121221 in words is "one hundred one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".