113121212020 has 12 divisors (see below), whose sum is σ = 237554545284. Its totient is φ = 45248484800.

The previous prime is 113121212003. The next prime is 113121212063. The reversal of 113121212020 is 20212121311.

It can be written as a sum of positive squares in 2 ways, for example, as 48151280356 + 64969931664 = 219434^2 + 254892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 113121211985 and 113121212003.

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 3 ways as a sum of consecutive naturals, for example, 2828030281 + ... + 2828030320.

It is an arithmetic number, because the mean of its divisors is an integer number (19796212107).

Almost surely, 2^113121212020 is an apocalyptic number.

113121212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

113121212020 is an abundant number, since it is smaller than the sum of its proper divisors (124433333264).

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

113121212020 is a wasteful number, since it uses less digits than its factorization.

113121212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5656060610 (or 5656060608 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 113121212020 its reverse (20212121311), we get a palindrome (133333333331).

The spelling of 113121212020 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred twelve thousand, twenty".