9002211221 has 4 divisors (see below), whose sum is σ = 9004818732. Its totient is φ = 8999603712.

The previous prime is 9002211203. The next prime is 9002211269. The reversal of 9002211221 is 1221122009.

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 1163764996 + 7838446225 = 34114^2 + 88535^2 .

It is a cyclic number.

It is not a de Polignac number, because 9002211221 - 2²⁶ = 8935102357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9002211193 and 9002211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9002211721) 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, 1298570 + ... + 1305483.

It is an arithmetic number, because the mean of its divisors is an integer number (2251204683).

Almost surely, 2^9002211221 is an apocalyptic number.

It is an amenable number.

9002211221 is a deficient number, since it is larger than the sum of its proper divisors (2607511).

9002211221 is a wasteful number, since it uses less digits than its factorization.

9002211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607510.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 9002211221 is about 94879.9832472582. The cubic root of 9002211221 is about 2080.2541618814.

The spelling of 9002211221 in words is "nine billion, two million, two hundred eleven thousand, two hundred twenty-one".