221220021111011 has 8 divisors (see below), whose sum is σ = 238237739999280. Its totient is φ = 204202415678112.

The previous prime is 221220021110953. The next prime is 221220021111013. The reversal of 221220021111011 is 110111120022122.

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-221220021111011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220021111013) 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, 24292520 + ... + 32133573.

It is an arithmetic number, because the mean of its divisors is an integer number (29779717499910).

Almost surely, 2^{221220021111011} is an apocalyptic number.

221220021111011 is a deficient number, since it is larger than the sum of its proper divisors (17017718888269).

221220021111011 is a wasteful number, since it uses less digits than its factorization.

221220021111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56727685.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221220021111011 its reverse (110111120022122), we get a palindrome (331331141133133).

The spelling of 221220021111011 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty-one million, one hundred eleven thousand, eleven".