111021010001221 has 32 divisors (see below), whose sum is σ = 114604290478080. Its totient is φ = 107507172605376.

The previous prime is 111021010001219. The next prime is 111021010001263. The reversal of 111021010001221 is 122100010120111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111021010001221 - 2¹ = 111021010001219 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 (111021010001201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 899571300 + ... + 899694706.

It is an arithmetic number, because the mean of its divisors is an integer number (3581384077440).

Almost surely, 2^{111021010001221} is an apocalyptic number.

It is an amenable number.

111021010001221 is a deficient number, since it is larger than the sum of its proper divisors (3583280476859).

111021010001221 is a wasteful number, since it uses less digits than its factorization.

111021010001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124353.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111021010001221 its reverse (122100010120111), we get a palindrome (233121020121332).

The spelling of 111021010001221 in words is "one hundred eleven trillion, twenty-one billion, ten million, one thousand, two hundred twenty-one".