101210211221 has 4 divisors (see below), whose sum is σ = 115668812832. Its totient is φ = 86751609612.

The previous prime is 101210211211. The next prime is 101210211247. The reversal of 101210211221 is 122112012101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122112012101 = 109 ⋅1120293689.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101210211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101210211196 and 101210211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210211211) 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 3 ways as a sum of consecutive naturals, for example, 7229300795 + ... + 7229300808.

It is an arithmetic number, because the mean of its divisors is an integer number (28917203208).

Almost surely, 2^101210211221 is an apocalyptic number.

It is an amenable number.

101210211221 is a deficient number, since it is larger than the sum of its proper divisors (14458601611).

101210211221 is an equidigital number, since it uses as much as digits as its factorization.

101210211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14458601610.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 101210211221 its reverse (122112012101), we get a palindrome (223322223322).

The spelling of 101210211221 in words is "one hundred one billion, two hundred ten million, two hundred eleven thousand, two hundred twenty-one".