220110021 has 32 divisors (see below), whose sum is σ = 334800000. Its totient is φ = 142871040.

The previous prime is 220110001. The next prime is 220110031. The reversal of 220110021 is 120011022.

It is not a de Polignac number, because 220110021 - 2⁶ = 220109957 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 220109985 and 220110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220110001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175605 + ... + 176853.

It is an arithmetic number, because the mean of its divisors is an integer number (10462500).

Almost surely, 2^220110021 is an apocalyptic number.

It is an amenable number.

220110021 is a deficient number, since it is larger than the sum of its proper divisors (114689979).

220110021 is a wasteful number, since it uses less digits than its factorization.

220110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426 (or 1420 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 220110021 is about 14836.1053177712. The cubic root of 220110021 is about 603.7816896294.

Adding to 220110021 its reverse (120011022), we get a palindrome (340121043).

The spelling of 220110021 in words is "two hundred twenty million, one hundred ten thousand, twenty-one".