100121110220021 has 8 divisors (see below), whose sum is σ = 110125698996288. Its totient is φ = 91019191107900.

The previous prime is 100121110219997. The next prime is 100121110220051. The reversal of 100121110220021 is 120022011121001.

It is not a de Polignac number, because 100121110220021 - 2¹⁴ = 100121110203637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121110219978 and 100121110220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121110220051) 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, 37611234665 + ... + 37611237326.

It is an arithmetic number, because the mean of its divisors is an integer number (13765712374536).

Almost surely, 2^{100121110220021} is an apocalyptic number.

100121110220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100121110220021 is a deficient number, since it is larger than the sum of its proper divisors (10004588776267).

100121110220021 is an frugal number, since it uses more digits than its factorization.

100121110220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75222472024 (or 75222472002 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 100121110220021 its reverse (120022011121001), we get a palindrome (220143121341022).

The spelling of 100121110220021 in words is "one hundred trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty thousand, twenty-one".