121212021111 has 8 divisors (see below), whose sum is σ = 161617638000. Its totient is φ = 80807209152.

The previous prime is 121212021097. The next prime is 121212021163. The reversal of 121212021111 is 111120212121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121212021111 - 2³⁵ = 86852282743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212021911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469891 + ... + 680603.

It is an arithmetic number, because the mean of its divisors is an integer number (20202204750).

Almost surely, 2^121212021111 is an apocalyptic number.

121212021111 is a deficient number, since it is larger than the sum of its proper divisors (40405616889).

121212021111 is a wasteful number, since it uses less digits than its factorization.

121212021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402465.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121212021111 its reverse (111120212121), we get a palindrome (232332233232).

The spelling of 121212021111 in words is "one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred eleven".