121000012221 has 12 divisors (see below), whose sum is σ = 177333351776. Its totient is φ = 73333340520.

The previous prime is 121000012219. The next prime is 121000012229. The reversal of 121000012221 is 122210000121.

It is not a de Polignac number, because 121000012221 - 2¹ = 121000012219 is a prime.

It is a Duffinian number.

121000012221 is a modest number, since divided by 12221 gives 1210 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121000012197 and 121000012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000012229) 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 11 ways as a sum of consecutive naturals, for example, 166666321 + ... + 166667046.

Almost surely, 2^121000012221 is an apocalyptic number.

121000012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121000012221 is a deficient number, since it is larger than the sum of its proper divisors (56333339555).

121000012221 is a wasteful number, since it uses less digits than its factorization.

121000012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333333392 (or 333333381 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121000012221 its reverse (122210000121), we get a palindrome (243210012342).

It can be divided in two parts, 1210000 and 12221, that added together give a palindrome (1222221).

The spelling of 121000012221 in words is "one hundred twenty-one billion, twelve thousand, two hundred twenty-one".