221220012221111 has 8 divisors (see below), whose sum is σ = 221231563515024. Its totient is φ = 221208461308800.

The previous prime is 221220012221083. The next prime is 221220012221269. The reversal of 221220012221111 is 111122210022122.

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 221220012221111 - 2⁴⁶ = 150851268043447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220012221311) 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, 2495359136 + ... + 2495447786.

It is an arithmetic number, because the mean of its divisors is an integer number (27653945439378).

Almost surely, 2^{221220012221111} is an apocalyptic number.

221220012221111 is a deficient number, since it is larger than the sum of its proper divisors (11551293913).

221220012221111 is an equidigital number, since it uses as much as digits as its factorization.

221220012221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190801.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221220012221111 its reverse (111122210022122), we get a palindrome (332342222243233).

The spelling of 221220012221111 in words is "two hundred twenty-one trillion, two hundred twenty billion, twelve million, two hundred twenty-one thousand, one hundred eleven".