121212220201212 has 24 divisors (see below), whose sum is σ = 323232587203456. Its totient is φ = 34632062914608.

The previous prime is 121212220201153. The next prime is 121212220201217. The reversal of 121212220201212 is 212102022212121.

It is a super-4 number, since 4×121212220201212⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212220201217) 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, 721501310638 + ... + 721501310805.

Almost surely, 2^{121212220201212} is an apocalyptic number.

121212220201212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121212220201212 is an abundant number, since it is smaller than the sum of its proper divisors (202020367002244).

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

121212220201212 is a wasteful number, since it uses less digits than its factorization.

121212220201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443002621457 (or 1443002621455 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121212220201212 its reverse (212102022212121), we get a palindrome (333314242413333).

The spelling of 121212220201212 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred one thousand, two hundred twelve".