111012001221 has 16 divisors (see below), whose sum is σ = 165227166720. Its totient is φ = 65715348720.

The previous prime is 111012001201. The next prime is 111012001241. The reversal of 111012001221 is 122100210111.

It is an interprime number because it is at equal distance from previous prime (111012001201) and next prime (111012001241).

It is not a de Polignac number, because 111012001221 - 2²³ = 111003612613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111012001197 and 111012001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012001201) 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, 39114861 + ... + 39117698.

It is an arithmetic number, because the mean of its divisors is an integer number (10326697920).

Almost surely, 2^111012001221 is an apocalyptic number.

111012001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111012001221 is a deficient number, since it is larger than the sum of its proper divisors (54215165499).

111012001221 is a wasteful number, since it uses less digits than its factorization.

111012001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78232616.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111012001221 its reverse (122100210111), we get a palindrome (233112211332).

The spelling of 111012001221 in words is "one hundred eleven billion, twelve million, one thousand, two hundred twenty-one".