100212110221021 has 4 divisors (see below), whose sum is σ = 100212914016412. Its totient is φ = 100211306425632.

The previous prime is 100212110220991. The next prime is 100212110221049. The reversal of 100212110221021 is 120122011212001.

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 32235300732996 + 67976809488025 = 5677614^2 + 8244805^2 .

It is a cyclic number.

It is not a de Polignac number, because 100212110221021 - 2²⁵ = 100212076666589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100212110220986 and 100212110221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212110225021) 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, 401710656 + ... + 401960041.

It is an arithmetic number, because the mean of its divisors is an integer number (25053228504103).

Almost surely, 2^{100212110221021} is an apocalyptic number.

It is an amenable number.

100212110221021 is a deficient number, since it is larger than the sum of its proper divisors (803795391).

100212110221021 is an equidigital number, since it uses as much as digits as its factorization.

100212110221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803795390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 100212110221021 its reverse (120122011212001), we get a palindrome (220334121433022).

The spelling of 100212110221021 in words is "one hundred trillion, two hundred twelve billion, one hundred ten million, two hundred twenty-one thousand, twenty-one".