101211211021 has 4 divisors (see below), whose sum is σ = 101227773852. Its totient is φ = 101194648192.

The previous prime is 101211211019. The next prime is 101211211039. The reversal of 101211211021 is 120112112101.

It is a happy number.

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 81893268900 + 19317942121 = 286170^2 + 138989^2 .

It is a cyclic number.

It is not a de Polignac number, because 101211211021 - 2¹ = 101211211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101211210992 and 101211211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211211001) 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, 8272246 + ... + 8284471.

It is an arithmetic number, because the mean of its divisors is an integer number (25306943463).

Almost surely, 2^101211211021 is an apocalyptic number.

It is an amenable number.

101211211021 is a deficient number, since it is larger than the sum of its proper divisors (16562831).

101211211021 is an equidigital number, since it uses as much as digits as its factorization.

101211211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562830.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 101211211021 its reverse (120112112101), we get a palindrome (221323323122).

The spelling of 101211211021 in words is "one hundred one billion, two hundred eleven million, two hundred eleven thousand, twenty-one".