202221210012121 has 4 divisors (see below), whose sum is σ = 204305964754612. Its totient is φ = 200136455269632.

The previous prime is 202221210012119. The next prime is 202221210012149. The reversal of 202221210012121 is 121210012122202.

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 91048542628096 + 111172667384025 = 9541936^2 + 10543845^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221210012121 - 2¹ = 202221210012119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202221210012181) 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, 1042377371100 + ... + 1042377371293.

It is an arithmetic number, because the mean of its divisors is an integer number (51076491188653).

Almost surely, 2^{202221210012121} is an apocalyptic number.

It is an amenable number.

202221210012121 is a deficient number, since it is larger than the sum of its proper divisors (2084754742491).

202221210012121 is an equidigital number, since it uses as much as digits as its factorization.

202221210012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084754742490.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202221210012121 its reverse (121210012122202), we get a palindrome (323431222134323).

The spelling of 202221210012121 in words is "two hundred two trillion, two hundred twenty-one billion, two hundred ten million, twelve thousand, one hundred twenty-one".