10000212122221 has 4 divisors (see below), whose sum is σ = 10028866025500. Its totient is φ = 9971558218944.

The previous prime is 10000212122209. The next prime is 10000212122239. The reversal of 10000212122221 is 12222121200001.

It is a happy number.

10000212122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3717419219721 + 6282792902500 = 1928061^2 + 2506550^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000212122221 - 2¹⁵ = 10000212089453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10000212122195 and 10000212122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000212122261) 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, 14326951116 + ... + 14326951813.

It is an arithmetic number, because the mean of its divisors is an integer number (2507216506375).

Almost surely, 2^{10000212122221} is an apocalyptic number.

It is an amenable number.

10000212122221 is a deficient number, since it is larger than the sum of its proper divisors (28653903279).

10000212122221 is an equidigital number, since it uses as much as digits as its factorization.

10000212122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28653903278.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10000212122221 its reverse (12222121200001), we get a palindrome (22222333322222).

The spelling of 10000212122221 in words is "ten trillion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".