202210112212121 has 4 divisors (see below), whose sum is σ = 217764736228452. Its totient is φ = 186655488195792.

The previous prime is 202210112212111. The next prime is 202210112212127. The reversal of 202210112212121 is 121212211012202.

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 8751917556496 + 193458194655625 = 2958364^2 + 13908925^2 .

It is a cyclic number.

It is not a de Polignac number, because 202210112212121 - 2⁶ = 202210112212057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202210112212093 and 202210112212102.

It is not an unprimeable number, because it can be changed into a prime (202210112212127) 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, 7777312008146 + ... + 7777312008171.

It is an arithmetic number, because the mean of its divisors is an integer number (54441184057113).

Almost surely, 2^{202210112212121} is an apocalyptic number.

It is an amenable number.

202210112212121 is a deficient number, since it is larger than the sum of its proper divisors (15554624016331).

202210112212121 is a wasteful number, since it uses less digits than its factorization.

202210112212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15554624016330.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 202210112212121 its reverse (121212211012202), we get a palindrome (323422323224323).

The spelling of 202210112212121 in words is "two hundred two trillion, two hundred ten billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".