121012211221 has 8 divisors (see below), whose sum is σ = 132298452864. Its totient is φ = 109773491520.

The previous prime is 121012211213. The next prime is 121012211237. The reversal of 121012211221 is 122112210121.

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

It is not a de Polignac number, because 121012211221 - 2³ = 121012211213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012211195 and 121012211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012211251) 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 7 ways as a sum of consecutive naturals, for example, 11875156 + ... + 11885341.

It is an arithmetic number, because the mean of its divisors is an integer number (16537306608).

Almost surely, 2^121012211221 is an apocalyptic number.

121012211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121012211221 is a deficient number, since it is larger than the sum of its proper divisors (11286241643).

121012211221 is a wasteful number, since it uses less digits than its factorization.

121012211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23760971.

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

Adding to 121012211221 its reverse (122112210121), we get a palindrome (243124421342).

It can be divided in two parts, 121012 and 211221, that added together give a palindrome (332233).

The spelling of 121012211221 in words is "one hundred twenty-one billion, twelve million, two hundred eleven thousand, two hundred twenty-one".