121210442020 has 24 divisors (see below), whose sum is σ = 254633311800. Its totient is φ = 48466770432.

The previous prime is 121210442011. The next prime is 121210442033. The reversal of 121210442020 is 20244012121.

It can be written as a sum of positive squares in 4 ways, for example, as 7394624064 + 113815817956 = 85992^2 + 337366^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030725 + ... + 1142284.

It is an arithmetic number, because the mean of its divisors is an integer number (10609721325).

Almost surely, 2^121210442020 is an apocalyptic number.

121210442020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210442020 is an abundant number, since it is smaller than the sum of its proper divisors (133422869780).

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

121210442020 is a wasteful number, since it uses less digits than its factorization.

121210442020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175807 (or 2175805 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121210442020 its reverse (20244012121), we get a palindrome (141454454141).

The spelling of 121210442020 in words is "one hundred twenty-one billion, two hundred ten million, four hundred forty-two thousand, twenty".