101211101012221 has 4 divisors (see below), whose sum is σ = 101317303637532. Its totient is φ = 101104898386912.

The previous prime is 101211101012191. The next prime is 101211101012237. The reversal of 101211101012221 is 122210101112101.

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 14827813476100 + 86383287536121 = 3850690^2 + 9294261^2 .

It is a cyclic number.

It is not a de Polignac number, because 101211101012221 - 2¹³ = 101211101004029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101211101012195 and 101211101012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211101013221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53101311226 + ... + 53101313131.

It is an arithmetic number, because the mean of its divisors is an integer number (25329325909383).

Almost surely, 2^{101211101012221} is an apocalyptic number.

It is an amenable number.

101211101012221 is a deficient number, since it is larger than the sum of its proper divisors (106202625311).

101211101012221 is an equidigital number, since it uses as much as digits as its factorization.

101211101012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106202625310.

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

Adding to 101211101012221 its reverse (122210101112101), we get a palindrome (223421202124322).

The spelling of 101211101012221 in words is "one hundred one trillion, two hundred eleven billion, one hundred one million, twelve thousand, two hundred twenty-one".