100020021221 has 8 divisors (see below), whose sum is σ = 104886373080. Its totient is φ = 95248161792.

The previous prime is 100020021209. The next prime is 100020021239. The reversal of 100020021221 is 122120020001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32295684100 + 67724337121 = 179710^2 + 260239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100020021221 - 2¹⁰ = 100020020197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020021281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23620940 + ... + 23625173.

It is an arithmetic number, because the mean of its divisors is an integer number (13110796635).

Almost surely, 2^100020021221 is an apocalyptic number.

It is an amenable number.

100020021221 is a deficient number, since it is larger than the sum of its proper divisors (4866351859).

100020021221 is an equidigital number, since it uses as much as digits as its factorization.

100020021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47246215.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100020021221 its reverse (122120020001), we get a palindrome (222140041222).

The spelling of 100020021221 in words is "one hundred billion, twenty million, twenty-one thousand, two hundred twenty-one".