121211102112221 has 8 divisors (see below), whose sum is σ = 132230376849600. Its totient is φ = 110191841314240.

The previous prime is 121211102112209. The next prime is 121211102112253. The reversal of 121211102112221 is 122211201112121.

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 a de Polignac number, because none of the positive numbers 2^k-121211102112221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211102112193 and 121211102112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211102132221) 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, 24393560 + ... + 28939038.

It is an arithmetic number, because the mean of its divisors is an integer number (16528797106200).

Almost surely, 2^{121211102112221} is an apocalyptic number.

121211102112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211102112221 is a deficient number, since it is larger than the sum of its proper divisors (11019274737379).

121211102112221 is a wasteful number, since it uses less digits than its factorization.

121211102112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6969699.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121211102112221 its reverse (122211201112121), we get a palindrome (243422303224342).

The spelling of 121211102112221 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred twelve thousand, two hundred twenty-one".