1111021010221 has 4 divisors (see below), whose sum is σ = 1111067580700. Its totient is φ = 1110974439744.

The previous prime is 1111021010191. The next prime is 1111021010257. The reversal of 1111021010221 is 1220101201111.

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 484152947721 + 626868062500 = 695811^2 + 791750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111021010221 - 2¹⁹ = 1111020485933 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 (1111021010621) 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, 23249436 + ... + 23297173.

It is an arithmetic number, because the mean of its divisors is an integer number (277766895175).

Almost surely, 2^{1111021010221} is an apocalyptic number.

It is an amenable number.

1111021010221 is a deficient number, since it is larger than the sum of its proper divisors (46570479).

1111021010221 is an equidigital number, since it uses as much as digits as its factorization.

1111021010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46570478.

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

Adding to 1111021010221 its reverse (1220101201111), we get a palindrome (2331122211332).

The spelling of 1111021010221 in words is "one trillion, one hundred eleven billion, twenty-one million, ten thousand, two hundred twenty-one".