111221021012010 has 64 divisors (see below), whose sum is σ = 328529785151232. Its totient is φ = 23466413223936.

The previous prime is 111221021011999. The next prime is 111221021012021. The reversal of 111221021012010 is 10210120122111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111221021011999) and next prime (111221021012021).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20370147639 + ... + 20370153098.

It is an arithmetic number, because the mean of its divisors is an integer number (5133277892988).

Almost surely, 2^{111221021012010} is an apocalyptic number.

111221021012010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111221021012010 is an abundant number, since it is smaller than the sum of its proper divisors (217308764139222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111221021012010 is a wasteful number, since it uses less digits than its factorization.

111221021012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40740300767.

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

Adding to 111221021012010 its reverse (10210120122111), we get a palindrome (121431141134121).

The spelling of 111221021012010 in words is "one hundred eleven trillion, two hundred twenty-one billion, twenty-one million, twelve thousand, ten".