121131110221 has 8 divisors (see below), whose sum is σ = 133953208704. Its totient is φ = 108610708320.

The previous prime is 121131110197. The next prime is 121131110249. The reversal of 121131110221 is 122011131121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121131110221 - 2⁹ = 121131109709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121131110195 and 121131110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131410221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75423301 + ... + 75424906.

It is an arithmetic number, because the mean of its divisors is an integer number (16744151088).

Almost surely, 2^121131110221 is an apocalyptic number.

121131110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121131110221 is a deficient number, since it is larger than the sum of its proper divisors (12822098483).

121131110221 is a wasteful number, since it uses less digits than its factorization.

121131110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150848291.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121131110221 its reverse (122011131121), we get a palindrome (243142241342).

The spelling of 121131110221 in words is "one hundred twenty-one billion, one hundred thirty-one million, one hundred ten thousand, two hundred twenty-one".