121221210221 has 8 divisors (see below), whose sum is σ = 123150393600. Its totient is φ = 119301895440.

The previous prime is 121221210211. The next prime is 121221210283. The reversal of 121221210221 is 122012122121.

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 121221210221 - 2³⁴ = 104041341037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221210211) 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, 2442386 + ... + 2491523.

It is an arithmetic number, because the mean of its divisors is an integer number (15393799200).

Almost surely, 2^121221210221 is an apocalyptic number.

It is an amenable number.

121221210221 is a deficient number, since it is larger than the sum of its proper divisors (1929183379).

121221210221 is an equidigital number, since it uses as much as digits as its factorization.

121221210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4934299.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221210221 its reverse (122012122121), we get a palindrome (243233332342).

The spelling of 121221210221 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".