2011023221 has 4 divisors (see below), whose sum is σ = 2030934444. Its totient is φ = 1991112000.

The previous prime is 2011023181. The next prime is 2011023247. The reversal of 2011023221 is 1223201102.

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 1539699121 + 471324100 = 39239^2 + 21710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011023221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011023196 and 2011023205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011023271) 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, 9955460 + ... + 9955661.

It is an arithmetic number, because the mean of its divisors is an integer number (507733611).

Almost surely, 2^2011023221 is an apocalyptic number.

It is an amenable number.

2011023221 is a deficient number, since it is larger than the sum of its proper divisors (19911223).

2011023221 is a wasteful number, since it uses less digits than its factorization.

2011023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19911222.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2011023221 is about 44844.4335564627. The cubic root of 2011023221 is about 1262.2315415988.

Adding to 2011023221 its reverse (1223201102), we get a palindrome (3234224323).

The spelling of 2011023221 in words is "two billion, eleven million, twenty-three thousand, two hundred twenty-one".