101212100221 has 4 divisors (see below), whose sum is σ = 101225932444. Its totient is φ = 101198268000.

The previous prime is 101212100191. The next prime is 101212100237. The reversal of 101212100221 is 122001212101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16464739225 + 84747360996 = 128315^2 + 291114^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212100221 - 2¹¹ = 101212098173 is a prime.

It is a super-2 number, since 2×101212100221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212130221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6905130 + ... + 6919771.

It is an arithmetic number, because the mean of its divisors is an integer number (25306483111).

Almost surely, 2^101212100221 is an apocalyptic number.

It is an amenable number.

101212100221 is a deficient number, since it is larger than the sum of its proper divisors (13832223).

101212100221 is an equidigital number, since it uses as much as digits as its factorization.

101212100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13832222.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101212100221 its reverse (122001212101), we get a palindrome (223213312322).

The spelling of 101212100221 in words is "one hundred one billion, two hundred twelve million, one hundred thousand, two hundred twenty-one".