4011221021 has 8 divisors (see below), whose sum is σ = 4040769720. Its totient is φ = 3981777408.

The previous prime is 4011221017. The next prime is 4011221051. The reversal of 4011221021 is 1201221104.

It is a happy number.

4011221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1576884100 + 2434336921 = 39710^2 + 49339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4011221021 - 2² = 4011221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4011220987 and 4011221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4011221051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51185 + ... + 103161.

It is an arithmetic number, because the mean of its divisors is an integer number (505096215).

Almost surely, 2^4011221021 is an apocalyptic number.

It is an amenable number.

4011221021 is a deficient number, since it is larger than the sum of its proper divisors (29548699).

4011221021 is a wasteful number, since it uses less digits than its factorization.

4011221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52543.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 4011221021 is about 63334.2010370384. The cubic root of 4011221021 is about 1588.8840211740.

Adding to 4011221021 its reverse (1201221104), we get a palindrome (5212442125).

The spelling of 4011221021 in words is "four billion, eleven million, two hundred twenty-one thousand, twenty-one".