100121221220021 has 8 divisors (see below), whose sum is σ = 100385128082304. Its totient is φ = 99857438004240.

The previous prime is 100121221219969. The next prime is 100121221220159. The reversal of 100121221220021 is 120022122121001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121221220021 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 (100121221220921) 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, 29289905 + ... + 32529078.

It is an arithmetic number, because the mean of its divisors is an integer number (12548141010288).

Almost surely, 2^{100121221220021} is an apocalyptic number.

It is an amenable number.

100121221220021 is a deficient number, since it is larger than the sum of its proper divisors (263906862283).

100121221220021 is an equidigital number, since it uses as much as digits as its factorization.

100121221220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61823251.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 100121221220021 its reverse (120022122121001), we get a palindrome (220143343341022).

The spelling of 100121221220021 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".