220221100021 has 16 divisors (see below), whose sum is σ = 237824512128. Its totient is φ = 202713249600.

The previous prime is 220221100013. The next prime is 220221100037. The reversal of 220221100021 is 120001122022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 220221100021 - 2³ = 220221100013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221099974 and 220221100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221100081) 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, 6889486 + ... + 6921376.

It is an arithmetic number, because the mean of its divisors is an integer number (14864032008).

Almost surely, 2^220221100021 is an apocalyptic number.

It is an amenable number.

220221100021 is a deficient number, since it is larger than the sum of its proper divisors (17603412107).

220221100021 is a wasteful number, since it uses less digits than its factorization.

220221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33372.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220221100021 its reverse (120001122022), we get a palindrome (340222222043).

The spelling of 220221100021 in words is "two hundred twenty billion, two hundred twenty-one million, one hundred thousand, twenty-one".