121021101111 has 16 divisors (see below), whose sum is σ = 161971469568. Its totient is φ = 80376307200.

The previous prime is 121021101067. The next prime is 121021101133. The reversal of 121021101111 is 111101120121.

It is not a de Polignac number, because 121021101111 - 2³⁴ = 103841231927 is a prime.

It is a super-2 number, since 2×121021101111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021101181) 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, 778726 + ... + 921116.

It is an arithmetic number, because the mean of its divisors is an integer number (10123216848).

Almost surely, 2^121021101111 is an apocalyptic number.

121021101111 is a deficient number, since it is larger than the sum of its proper divisors (40950368457).

121021101111 is a wasteful number, since it uses less digits than its factorization.

121021101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143462.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121021101111 its reverse (111101120121), we get a palindrome (232122221232).

The spelling of 121021101111 in words is "one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred eleven".