100121211112201 has 4 divisors (see below), whose sum is σ = 100121231148804. Its totient is φ = 100121191075600.

The previous prime is 100121211112157. The next prime is 100121211112211. The reversal of 100121211112201 is 102211112121001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63239457000976 + 36881754111225 = 7952324^2 + 6073035^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121211112201 - 2³¹ = 100119063628553 is a prime.

It is a super-2 number, since 2×100121211112201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100121211112211) 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, 4266471 + ... + 14779891.

It is an arithmetic number, because the mean of its divisors is an integer number (25030307787201).

Almost surely, 2^{100121211112201} is an apocalyptic number.

It is an amenable number.

100121211112201 is a deficient number, since it is larger than the sum of its proper divisors (20036603).

100121211112201 is an equidigital number, since it uses as much as digits as its factorization.

100121211112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20036602.

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

Adding to 100121211112201 its reverse (102211112121001), we get a palindrome (202332323233202).

The spelling of 100121211112201 in words is "one hundred trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred one".