101210221 has 4 divisors (see below), whose sum is σ = 115668832. Its totient is φ = 86751612.

The previous prime is 101210191. The next prime is 101210227. The reversal of 101210221 is 122012101.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101210221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101210198 and 101210207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7229295 + ... + 7229308.

It is an arithmetic number, because the mean of its divisors is an integer number (28917208).

Almost surely, 2^101210221 is an apocalyptic number.

It is an amenable number.

101210221 is a deficient number, since it is larger than the sum of its proper divisors (14458611).

101210221 is an equidigital number, since it uses as much as digits as its factorization.

101210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14458610.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 101210221 is about 10060.3290701647. The cubic root of 101210221 is about 466.0238295759.

Adding to 101210221 its reverse (122012101), we get a palindrome (223222322).

The spelling of 101210221 in words is "one hundred one million, two hundred ten thousand, two hundred twenty-one".