1010211110221 has 4 divisors (see below), whose sum is σ = 1010213120412. Its totient is φ = 1010209100032.

The previous prime is 1010211110197. The next prime is 1010211110261. The reversal of 1010211110221 is 1220111120101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 869582360196 + 140628750025 = 932514^2 + 375005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010211110221 - 2⁹ = 1010211109709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010211110261) 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, 499245 + ... + 1506541.

It is an arithmetic number, because the mean of its divisors is an integer number (252553280103).

Almost surely, 2^{1010211110221} is an apocalyptic number.

It is an amenable number.

1010211110221 is a deficient number, since it is larger than the sum of its proper divisors (2010191).

1010211110221 is a wasteful number, since it uses less digits than its factorization.

1010211110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010190.

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

Adding to 1010211110221 its reverse (1220111120101), we get a palindrome (2230322230322).

The spelling of 1010211110221 in words is "one trillion, ten billion, two hundred eleven million, one hundred ten thousand, two hundred twenty-one".