121221021011 has 4 divisors (see below), whose sum is σ = 121249757400. Its totient is φ = 121192284624.

The previous prime is 121221021001. The next prime is 121221021113. The reversal of 121221021011 is 110120122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121221021011 - 2¹⁰ = 121221019987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221021001) 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, 14361866 + ... + 14370303.

It is an arithmetic number, because the mean of its divisors is an integer number (30312439350).

Almost surely, 2^121221021011 is an apocalyptic number.

121221021011 is a deficient number, since it is larger than the sum of its proper divisors (28736389).

121221021011 is an equidigital number, since it uses as much as digits as its factorization.

121221021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28736388.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221021011 its reverse (110120122121), we get a palindrome (231341143132).

The spelling of 121221021011 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, eleven".