121010111221 has 4 divisors (see below), whose sum is σ = 122816232352. Its totient is φ = 119203990092.

The previous prime is 121010111197. The next prime is 121010111269. The reversal of 121010111221 is 122111010121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122111010121 = 97 ⋅1258876393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121010111221 is a prime.

It is a super-2 number, since 2×121010111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010115221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903060465 + ... + 903060598.

It is an arithmetic number, because the mean of its divisors is an integer number (30704058088).

Almost surely, 2^121010111221 is an apocalyptic number.

It is an amenable number.

121010111221 is a deficient number, since it is larger than the sum of its proper divisors (1806121131).

121010111221 is an equidigital number, since it uses as much as digits as its factorization.

121010111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806121130.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121010111221 its reverse (122111010121), we get a palindrome (243121121342).

The spelling of 121010111221 in words is "one hundred twenty-one billion, ten million, one hundred eleven thousand, two hundred twenty-one".