121212111966 has 32 divisors (see below), whose sum is σ = 264486377088. Its totient is φ = 36727667040.

The previous prime is 121212111959. The next prime is 121212111967. The reversal of 121212111966 is 669111212121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212111967) 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, 723216 + ... + 874908.

It is an arithmetic number, because the mean of its divisors is an integer number (8265199284).

Almost surely, 2^121212111966 is an apocalyptic number.

121212111966 is an abundant number, since it is smaller than the sum of its proper divisors (143274265122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121212111966 is a wasteful number, since it uses less digits than its factorization.

121212111966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163816.

The product of its digits is 2592, while the sum is 33.

The spelling of 121212111966 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred sixty-six".