221012221111221 has 16 divisors (see below), whose sum is σ = 294838647166080. Its totient is φ = 147263641831680.

The previous prime is 221012221111189. The next prime is 221012221111247. The reversal of 221012221111221 is 122111122210122.

221012221111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221012221111221 - 2⁵ = 221012221111189 is a prime.

It is a super-2 number, since 2×221012221111221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012221111621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234138961 + ... + 235081001.

It is an arithmetic number, because the mean of its divisors is an integer number (18427415447880).

Almost surely, 2^{221012221111221} is an apocalyptic number.

It is an amenable number.

221012221111221 is a deficient number, since it is larger than the sum of its proper divisors (73826426054859).

221012221111221 is a wasteful number, since it uses less digits than its factorization.

221012221111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983276.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221012221111221 its reverse (122111122210122), we get a palindrome (343123343321343).

The spelling of 221012221111221 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".