121011220221 has 8 divisors (see below), whose sum is σ = 161863784640. Its totient is φ = 80416401312.

The previous prime is 121011220217. The next prime is 121011220243. The reversal of 121011220221 is 122022110121.

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

It is not a de Polignac number, because 121011220221 - 2² = 121011220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011220201) 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, 64435281 + ... + 64437158.

It is an arithmetic number, because the mean of its divisors is an integer number (20232973080).

Almost surely, 2^121011220221 is an apocalyptic number.

It is an amenable number.

121011220221 is a deficient number, since it is larger than the sum of its proper divisors (40852564419).

121011220221 is a wasteful number, since it uses less digits than its factorization.

121011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128872755.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121011220221 its reverse (122022110121), we get a palindrome (243033330342).

The spelling of 121011220221 in words is "one hundred twenty-one billion, eleven million, two hundred twenty thousand, two hundred twenty-one".