100221222021221 has 4 divisors (see below), whose sum is σ = 114538539452832. Its totient is φ = 85903904589612.

The previous prime is 100221222021103. The next prime is 100221222021293. The reversal of 100221222021221 is 122120222122001.

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 a de Polignac number, because none of the positive numbers 2^k-100221222021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221222021193 and 100221222021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221222081221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7158658715795 + ... + 7158658715808.

It is an arithmetic number, because the mean of its divisors is an integer number (28634634863208).

Almost surely, 2^{100221222021221} is an apocalyptic number.

It is an amenable number.

100221222021221 is a deficient number, since it is larger than the sum of its proper divisors (14317317431611).

100221222021221 is an equidigital number, since it uses as much as digits as its factorization.

100221222021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14317317431610.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 100221222021221 its reverse (122120222122001), we get a palindrome (222341444143222).

The spelling of 100221222021221 in words is "one hundred trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".