100021001220221 has 4 divisors (see below), whose sum is σ = 100021257849312. Its totient is φ = 100020744591132.

The previous prime is 100021001220187. The next prime is 100021001220307. The reversal of 100021001220221 is 122022100120001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100021001220221 - 2⁶ = 100021001220157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021001220196 and 100021001220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021001226221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127729031 + ... + 128509716.

It is an arithmetic number, because the mean of its divisors is an integer number (25005314462328).

Almost surely, 2^{100021001220221} is an apocalyptic number.

It is an amenable number.

100021001220221 is a deficient number, since it is larger than the sum of its proper divisors (256629091).

100021001220221 is an equidigital number, since it uses as much as digits as its factorization.

100021001220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256629090.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100021001220221 its reverse (122022100120001), we get a palindrome (222043101340222).

The spelling of 100021001220221 in words is "one hundred trillion, twenty-one billion, one million, two hundred twenty thousand, two hundred twenty-one".