121202111221 has 4 divisors (see below), whose sum is σ = 121545460332. Its totient is φ = 120858762112.

The previous prime is 121202111183. The next prime is 121202111227. The reversal of 121202111221 is 122111202121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111202121 = 373 ⋅327375877.

It can be written as a sum of positive squares in 2 ways, for example, as 79079064100 + 42123047121 = 281210^2 + 205239^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202111221 - 2²⁹ = 120665240309 is a prime.

It is a super-2 number, since 2×121202111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121202111195 and 121202111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202111227) 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, 171674026 + ... + 171674731.

It is an arithmetic number, because the mean of its divisors is an integer number (30386365083).

Almost surely, 2^121202111221 is an apocalyptic number.

It is an amenable number.

121202111221 is a deficient number, since it is larger than the sum of its proper divisors (343349111).

121202111221 is an equidigital number, since it uses as much as digits as its factorization.

121202111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343349110.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121202111221 its reverse (122111202121), we get a palindrome (243313313342).

The spelling of 121202111221 in words is "one hundred twenty-one billion, two hundred two million, one hundred eleven thousand, two hundred twenty-one".