100121021221 has 8 divisors (see below), whose sum is σ = 109187482880. Its totient is φ = 91249537392.

The previous prime is 100121021197. The next prime is 100121021251. The reversal of 100121021221 is 122120121001.

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

It is not a de Polignac number, because 100121021221 - 2⁹ = 100121020709 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121021251) 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, 48743385 + ... + 48745438.

It is an arithmetic number, because the mean of its divisors is an integer number (13648435360).

Almost surely, 2^100121021221 is an apocalyptic number.

It is an amenable number.

100121021221 is a deficient number, since it is larger than the sum of its proper divisors (9066461659).

100121021221 is an equidigital number, since it uses as much as digits as its factorization.

100121021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97488915.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100121021221 its reverse (122120121001), we get a palindrome (222241142222).

The spelling of 100121021221 in words is "one hundred billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-one".