1021011110221 has 4 divisors (see below), whose sum is σ = 1042734750912. Its totient is φ = 999287469532.

The previous prime is 1021011110179. The next prime is 1021011110261. The reversal of 1021011110221 is 1220111101201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021011110221 - 2²¹ = 1021009013069 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 (1021011110261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10861820275 + ... + 10861820368.

It is an arithmetic number, because the mean of its divisors is an integer number (260683687728).

Almost surely, 2^{1021011110221} is an apocalyptic number.

It is an amenable number.

1021011110221 is a deficient number, since it is larger than the sum of its proper divisors (21723640691).

1021011110221 is an equidigital number, since it uses as much as digits as its factorization.

1021011110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21723640690.

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

Adding to 1021011110221 its reverse (1220111101201), we get a palindrome (2241122211422).

The spelling of 1021011110221 in words is "one trillion, twenty-one billion, eleven million, one hundred ten thousand, two hundred twenty-one".