210100021212005 has 4 divisors (see below), whose sum is σ = 252120025454412. Its totient is φ = 168080016969600.

The previous prime is 210100021211989. The next prime is 210100021212031. The reversal of 210100021212005 is 500212120001012.

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 161439030809956 + 48660990402049 = 12705866^2 + 6975743^2 .

It is not a de Polignac number, because 210100021212005 - 2⁴ = 210100021211989 is a prime.

It is a super-2 number, since 2×210100021212005² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21010002121196 + ... + 21010002121205.

It is an arithmetic number, because the mean of its divisors is an integer number (63030006363603).

Almost surely, 2^{210100021212005} is an apocalyptic number.

It is an amenable number.

210100021212005 is a deficient number, since it is larger than the sum of its proper divisors (42020004242407).

210100021212005 is an equidigital number, since it uses as much as digits as its factorization.

210100021212005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42020004242406.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 210100021212005 its reverse (500212120001012), we get a palindrome (710312141213017).

The spelling of 210100021212005 in words is "two hundred ten trillion, one hundred billion, twenty-one million, two hundred twelve thousand, five".