212100012021005 has 8 divisors (see below), whose sum is σ = 254520118869912. Its totient is φ = 169679939987008.

The previous prime is 212100012020993. The next prime is 212100012021031. The reversal of 212100012021005 is 500120210001212.

It can be written as a sum of positive squares in 4 ways, for example, as 38009456762761 + 174090555258244 = 6165181^2 + 13194338^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212100012021005 - 2²⁰ = 212100010972429 is a prime.

It is a super-2 number, since 2×212100012021005² (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 7 ways as a sum of consecutive naturals, for example, 7411787 + ... + 21889143.

It is an arithmetic number, because the mean of its divisors is an integer number (31815014858739).

Almost surely, 2^{212100012021005} is an apocalyptic number.

It is an amenable number.

212100012021005 is a deficient number, since it is larger than the sum of its proper divisors (42420106848907).

212100012021005 is a wasteful number, since it uses less digits than its factorization.

212100012021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17407455.

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

Adding to 212100012021005 its reverse (500120210001212), we get a palindrome (712220222022217).

The spelling of 212100012021005 in words is "two hundred twelve trillion, one hundred billion, twelve million, twenty-one thousand, five".