110100001221 has 16 divisors (see below), whose sum is σ = 186412700800. Its totient is φ = 62914286304.

The previous prime is 110100001211. The next prime is 110100001247. The reversal of 110100001221 is 122100001011.

It is a happy number.

It is not a de Polignac number, because 110100001221 - 2⁷ = 110100001093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110100001211) 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, 291269656 + ... + 291270033.

It is an arithmetic number, because the mean of its divisors is an integer number (11650793800).

Almost surely, 2^110100001221 is an apocalyptic number.

It is an amenable number.

110100001221 is a deficient number, since it is larger than the sum of its proper divisors (76312699579).

110100001221 is an equidigital number, since it uses as much as digits as its factorization.

110100001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582539705 (or 582539699 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 110100001221 its reverse (122100001011), we get a palindrome (232200002232).

The spelling of 110100001221 in words is "one hundred ten billion, one hundred million, one thousand, two hundred twenty-one".