110010001221 has 12 divisors (see below), whose sum is σ = 158919623148. Its totient is φ = 73332483264.

The previous prime is 110010001187. The next prime is 110010001291. The reversal of 110010001221 is 122100010011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58230998721 + 51779002500 = 241311^2 + 227550^2 .

It is not a de Polignac number, because 110010001221 - 2⁷ = 110010001093 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110010001291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 533050 + ... + 710043.

It is an arithmetic number, because the mean of its divisors is an integer number (13243301929).

Almost surely, 2^110010001221 is an apocalyptic number.

It is an amenable number.

110010001221 is a deficient number, since it is larger than the sum of its proper divisors (48909621927).

110010001221 is a wasteful number, since it uses less digits than its factorization.

110010001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252932 (or 1252929 counting only the distinct ones).

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

Adding to 110010001221 its reverse (122100010011), we get a palindrome (232110011232).

The spelling of 110010001221 in words is "one hundred ten billion, ten million, one thousand, two hundred twenty-one".