100000212121021 has 4 divisors (see below), whose sum is σ = 100040583626172. Its totient is φ = 99959840615872.

The previous prime is 100000212121003. The next prime is 100000212121049. The reversal of 100000212121021 is 120121212000001.

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 84564852687225 + 15435359433796 = 9195915^2 + 3928786^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000212121021 - 2¹¹ = 100000212118973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100000212120992 and 100000212121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000212121921) 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, 20185748860 + ... + 20185753813.

It is an arithmetic number, because the mean of its divisors is an integer number (25010145906543).

Almost surely, 2^{100000212121021} is an apocalyptic number.

It is an amenable number.

100000212121021 is a deficient number, since it is larger than the sum of its proper divisors (40371505151).

100000212121021 is an equidigital number, since it uses as much as digits as its factorization.

100000212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40371505150.

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

Adding to 100000212121021 its reverse (120121212000001), we get a palindrome (220121424121022).

The spelling of 100000212121021 in words is "one hundred trillion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".