10000212101221 has 4 divisors (see below), whose sum is σ = 10000406403244. Its totient is φ = 10000017799200.

The previous prime is 10000212101179. The next prime is 10000212101261. The reversal of 10000212101221 is 12210121200001.

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 5438737052100 + 4561475049121 = 2332110^2 + 2135761^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000212101221 - 2¹³ = 10000212093029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000212101261) 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, 97073790 + ... + 97176751.

It is an arithmetic number, because the mean of its divisors is an integer number (2500101600811).

Almost surely, 2^{10000212101221} is an apocalyptic number.

It is an amenable number.

10000212101221 is a deficient number, since it is larger than the sum of its proper divisors (194302023).

10000212101221 is an equidigital number, since it uses as much as digits as its factorization.

10000212101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194302022.

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

Adding to 10000212101221 its reverse (12210121200001), we get a palindrome (22210333301222).

The spelling of 10000212101221 in words is "ten trillion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".