111020101021221 has 128 divisors (see below), whose sum is σ = 178376127283200. Its totient is φ = 60097696243200.

The previous prime is 111020101021201. The next prime is 111020101021243. The reversal of 111020101021221 is 122120101020111.

It is a happy number.

It is not a de Polignac number, because 111020101021221 - 2⁶ = 111020101021157 is a prime.

It is a super-2 number, since 2×111020101021221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111020101021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020101021201) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4645374930 + ... + 4645398828.

It is an arithmetic number, because the mean of its divisors is an integer number (1393563494400).

Almost surely, 2^{111020101021221} is an apocalyptic number.

It is an amenable number.

111020101021221 is a deficient number, since it is larger than the sum of its proper divisors (67356026261979).

111020101021221 is a wasteful number, since it uses less digits than its factorization.

111020101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24727.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111020101021221 its reverse (122120101020111), we get a palindrome (233140202041332).

The spelling of 111020101021221 in words is "one hundred eleven trillion, twenty billion, one hundred one million, twenty-one thousand, two hundred twenty-one".