121021110011 has 4 divisors (see below), whose sum is σ = 121022291232. Its totient is φ = 121019928792.

The previous prime is 121021109987. The next prime is 121021110013. The reversal of 121021110011 is 110011120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110011120121 = 7 ⋅15715874303.

It is a cyclic number.

It is not a de Polignac number, because 121021110011 - 2¹⁰ = 121021108987 is a prime.

It is a super-2 number, since 2×121021110011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021109974 and 121021110001.

It is not an unprimeable number, because it can be changed into a prime (121021110013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420620 + ... + 647273.

It is an arithmetic number, because the mean of its divisors is an integer number (30255572808).

Almost surely, 2^121021110011 is an apocalyptic number.

121021110011 is a deficient number, since it is larger than the sum of its proper divisors (1181221).

121021110011 is a wasteful number, since it uses less digits than its factorization.

121021110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181220.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121021110011 its reverse (110011120121), we get a palindrome (231032230132).

The spelling of 121021110011 in words is "one hundred twenty-one billion, twenty-one million, one hundred ten thousand, eleven".