1020011010221 has 6 divisors (see below), whose sum is σ = 1186543420110. Its totient is φ = 874295151576.

The previous prime is 1020011010191. The next prime is 1020011010229. The reversal of 1020011010221 is 1220101100201.

It can be written as a sum of positive squares in only one way, i.e., 917024572996 + 102986437225 = 957614^2 + 320915^2 .

It is not a de Polignac number, because 1020011010221 - 2¹⁸ = 1020010748077 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 (1020011010229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10408275566 + ... + 10408275663.

It is an arithmetic number, because the mean of its divisors is an integer number (197757236685).

Almost surely, 2^{1020011010221} is an apocalyptic number.

It is an amenable number.

1020011010221 is a deficient number, since it is larger than the sum of its proper divisors (166532409889).

1020011010221 is an equidigital number, since it uses as much as digits as its factorization.

1020011010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816551243 (or 20816551236 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1020011010221 its reverse (1220101100201), we get a palindrome (2240112110422).

The spelling of 1020011010221 in words is "one trillion, twenty billion, eleven million, ten thousand, two hundred twenty-one".