10110001221 has 24 divisors (see below), whose sum is σ = 14797735680. Its totient is φ = 6650388576.

The previous prime is 10110001211. The next prime is 10110001229. The reversal of 10110001221 is 12210001101.

It is a happy number.

It is not a de Polignac number, because 10110001221 - 2⁵ = 10110001189 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 (10110001229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1399200 + ... + 1406406.

It is an arithmetic number, because the mean of its divisors is an integer number (616572320).

Almost surely, 2^10110001221 is an apocalyptic number.

It is an amenable number.

10110001221 is a deficient number, since it is larger than the sum of its proper divisors (4687734459).

10110001221 is a wasteful number, since it uses less digits than its factorization.

10110001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265 (or 9262 counting only the distinct ones).

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

Adding to 10110001221 its reverse (12210001101), we get a palindrome (22320002322).

The spelling of 10110001221 in words is "ten billion, one hundred ten million, one thousand, two hundred twenty-one".