100221220021 has 16 divisors (see below), whose sum is σ = 110922972160. Its totient is φ = 89965753920.

The previous prime is 100221220019. The next prime is 100221220037. The reversal of 100221220021 is 120022122001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 100221220021 - 2¹ = 100221220019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 100221219983 and 100221220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221220061) 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, 263445 + ... + 519466.

It is an arithmetic number, because the mean of its divisors is an integer number (6932685760).

Almost surely, 2^100221220021 is an apocalyptic number.

It is an amenable number.

100221220021 is a deficient number, since it is larger than the sum of its proper divisors (10701752139).

100221220021 is a wasteful number, since it uses less digits than its factorization.

100221220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783196.

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

Adding to 100221220021 its reverse (120022122001), we get a palindrome (220243342022).

The spelling of 100221220021 in words is "one hundred billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".