10021212211121 has 4 divisors (see below), whose sum is σ = 10021238911332. Its totient is φ = 10021185510912.

The previous prime is 10021212211079. The next prime is 10021212211133. The reversal of 10021212211121 is 12111221212001.

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 9922090504225 + 99121706896 = 3149935^2 + 314836^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021212211121 - 2²² = 10021208016817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10021212211121.

It is not an unprimeable number, because it can be changed into a prime (10021212211421) 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, 12778976 + ... + 13540481.

It is an arithmetic number, because the mean of its divisors is an integer number (2505309727833).

Almost surely, 2^{10021212211121} is an apocalyptic number.

It is an amenable number.

10021212211121 is a deficient number, since it is larger than the sum of its proper divisors (26700211).

10021212211121 is an equidigital number, since it uses as much as digits as its factorization.

10021212211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26700210.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10021212211121 its reverse (12111221212001), we get a palindrome (22132433423122).

The spelling of 10021212211121 in words is "ten trillion, twenty-one billion, two hundred twelve million, two hundred eleven thousand, one hundred twenty-one".