121021011011 has 4 divisors (see below), whose sum is σ = 124924914624. Its totient is φ = 117117107400.

The previous prime is 121021010993. The next prime is 121021011127. The reversal of 121021011011 is 110110120121.

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 121021011011 - 2¹⁰ = 121021009987 is a prime.

It is a super-2 number, since 2×121021011011² (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 = 121021010983 and 121021011001.

It is not an unprimeable number, because it can be changed into a prime (121021011311) 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, 1951951760 + ... + 1951951821.

It is an arithmetic number, because the mean of its divisors is an integer number (31231228656).

Almost surely, 2^121021011011 is an apocalyptic number.

121021011011 is a deficient number, since it is larger than the sum of its proper divisors (3903903613).

121021011011 is an equidigital number, since it uses as much as digits as its factorization.

121021011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903903612.

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

Adding to 121021011011 its reverse (110110120121), we get a palindrome (231131131132).

It can be divided in two parts, 1210210 and 11011, that added together give a palindrome (1221221).

The spelling of 121021011011 in words is "one hundred twenty-one billion, twenty-one million, eleven thousand, eleven".