1212121044 has 48 divisors (see below), whose sum is σ = 3180421440. Its totient is φ = 399169440.

The previous prime is 1212121037. The next prime is 1212121051. The reversal of 1212121044 is 4401212121.

It is an interprime number because it is at equal distance from previous prime (1212121037) and next prime (1212121051).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58647 + ... + 76574.

It is an arithmetic number, because the mean of its divisors is an integer number (66258780).

Almost surely, 2^1212121044 is an apocalyptic number.

It is an amenable number.

1212121044 is an abundant number, since it is smaller than the sum of its proper divisors (1968300396).

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

1212121044 is a wasteful number, since it uses less digits than its factorization.

1212121044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135317 (or 135309 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1212121044 is about 34815.5287766824. The cubic root of 1212121044 is about 1066.2245149663.

Adding to 1212121044 its reverse (4401212121), we get a palindrome (5613333165).

The spelling of 1212121044 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, forty-four".