121221002011 has 4 divisors (see below), whose sum is σ = 121263375024. Its totient is φ = 121178629000.

The previous prime is 121221001939. The next prime is 121221002069. The reversal of 121221002011 is 110200122121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110200122121 = 128449 ⋅857929.

It is a cyclic number.

It is not a de Polignac number, because 121221002011 - 2⁷ = 121221001883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221001982 and 121221002000.

It is not an unprimeable number, because it can be changed into a prime (121221092011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21182215 + ... + 21187936.

It is an arithmetic number, because the mean of its divisors is an integer number (30315843756).

Almost surely, 2^121221002011 is an apocalyptic number.

121221002011 is a deficient number, since it is larger than the sum of its proper divisors (42373013).

121221002011 is an equidigital number, since it uses as much as digits as its factorization.

121221002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42373012.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221002011 its reverse (110200122121), we get a palindrome (231421124132).

The spelling of 121221002011 in words is "one hundred twenty-one billion, two hundred twenty-one million, two thousand, eleven".