121021021111 has 16 divisors (see below), whose sum is σ = 127358220960. Its totient is φ = 114839424000.

The previous prime is 121021021097. The next prime is 121021021141. The reversal of 121021021111 is 111120120121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121021021111 - 2¹⁹ = 121020496823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021021091 and 121021021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021021141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498111 + ... + 700111.

It is an arithmetic number, because the mean of its divisors is an integer number (7959888810).

Almost surely, 2^121021021111 is an apocalyptic number.

121021021111 is a deficient number, since it is larger than the sum of its proper divisors (6337199849).

121021021111 is a wasteful number, since it uses less digits than its factorization.

121021021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202386.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121021021111 its reverse (111120120121), we get a palindrome (232141141232).

It can be divided in two parts, 1210210 and 21111, that added together give a palindrome (1231321).

The spelling of 121021021111 in words is "one hundred twenty-one billion, twenty-one million, twenty-one thousand, one hundred eleven".