221211000221 has 8 divisors (see below), whose sum is σ = 225427532760. Its totient is φ = 216996050752.

The previous prime is 221211000203. The next prime is 221211000239. The reversal of 221211000221 is 122000112122.

It is an interprime number because it is at equal distance from previous prime (221211000203) and next prime (221211000239).

It can be written as a sum of positive squares in 4 ways, for example, as 14595297721 + 206615702500 = 120811^2 + 454550^2 .

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 221211000221 - 2³⁴ = 204031131037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221211000196 and 221211000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211000251) 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, 111710 + ... + 674463.

It is an arithmetic number, because the mean of its divisors is an integer number (28178441595).

Almost surely, 2^221211000221 is an apocalyptic number.

It is an amenable number.

221211000221 is a deficient number, since it is larger than the sum of its proper divisors (4216532539).

221211000221 is an equidigital number, since it uses as much as digits as its factorization.

221211000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791535.

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

Adding to 221211000221 its reverse (122000112122), we get a palindrome (343211112343).

The spelling of 221211000221 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one", and thus it is an aban number.