1011001020221 has 4 divisors (see below), whose sum is σ = 1011703593600. Its totient is φ = 1010298446844.

The previous prime is 1011001020157. The next prime is 1011001020317. The reversal of 1011001020221 is 1220201001101.

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 1011001020221 - 2⁶ = 1011001020157 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 (1011001020121) 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, 351284531 + ... + 351287408.

It is an arithmetic number, because the mean of its divisors is an integer number (252925898400).

Almost surely, 2^{1011001020221} is an apocalyptic number.

It is an amenable number.

1011001020221 is a deficient number, since it is larger than the sum of its proper divisors (702573379).

1011001020221 is an equidigital number, since it uses as much as digits as its factorization.

1011001020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702573378.

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

Adding to 1011001020221 its reverse (1220201001101), we get a palindrome (2231202021322).

The spelling of 1011001020221 in words is "one trillion, eleven billion, one million, twenty thousand, two hundred twenty-one".