101211201221 has 4 divisors (see below), whose sum is σ = 108996678252. Its totient is φ = 93425724192.

The previous prime is 101211201193. The next prime is 101211201233. The reversal of 101211201221 is 122102112101.

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 8484252100 + 92726949121 = 92110^2 + 304511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101211201221 is a prime.

It is a super-3 number, since 3×101211201221³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101211201196 and 101211201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211101221) 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, 3892738496 + ... + 3892738521.

It is an arithmetic number, because the mean of its divisors is an integer number (27249169563).

Almost surely, 2^101211201221 is an apocalyptic number.

It is an amenable number.

101211201221 is a deficient number, since it is larger than the sum of its proper divisors (7785477031).

101211201221 is an equidigital number, since it uses as much as digits as its factorization.

101211201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7785477030.

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

Adding to 101211201221 its reverse (122102112101), we get a palindrome (223313313322).

The spelling of 101211201221 in words is "one hundred one billion, two hundred eleven million, two hundred one thousand, two hundred twenty-one".