121122122010221 has 4 divisors (see below), whose sum is σ = 121122660467292. Its totient is φ = 121121583553152.

The previous prime is 121122122010209. The next prime is 121122122010233. The reversal of 121122122010221 is 122010221221121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (121122122010209) and next prime (121122122010233).

It can be written as a sum of positive squares in 2 ways, for example, as 111369080454025 + 9753041556196 = 10553155^2 + 3122986^2 .

It is a cyclic number.

It is not a de Polignac number, because 121122122010221 - 2¹⁸ = 121122121748077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121122122010193 and 121122122010202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122122010521) 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, 268890980 + ... + 269341053.

It is an arithmetic number, because the mean of its divisors is an integer number (30280665116823).

Almost surely, 2^{121122122010221} is an apocalyptic number.

It is an amenable number.

121122122010221 is a deficient number, since it is larger than the sum of its proper divisors (538457071).

121122122010221 is an equidigital number, since it uses as much as digits as its factorization.

121122122010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538457070.

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

Adding to 121122122010221 its reverse (122010221221121), we get a palindrome (243132343231342).

The spelling of 121122122010221 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, ten thousand, two hundred twenty-one".