221012002211221 has 8 divisors (see below), whose sum is σ = 238013141649920. Its totient is φ = 204010893657072.

The previous prime is 221012002211197. The next prime is 221012002211261. The reversal of 221012002211221 is 122112200210122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012002211221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012002211261) 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, 8385976 + ... + 22635118.

It is an arithmetic number, because the mean of its divisors is an integer number (29751642706240).

Almost surely, 2^{221012002211221} is an apocalyptic number.

It is an amenable number.

221012002211221 is a deficient number, since it is larger than the sum of its proper divisors (17001139438699).

221012002211221 is a wasteful number, since it uses less digits than its factorization.

221012002211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15442275.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221012002211221 its reverse (122112200210122), we get a palindrome (343124202421343).

The spelling of 221012002211221 in words is "two hundred twenty-one trillion, twelve billion, two million, two hundred eleven thousand, two hundred twenty-one".