121231302020020 has 24 divisors (see below), whose sum is σ = 256590346328064. Its totient is φ = 48110689934496.

The previous prime is 121231302019951. The next prime is 121231302020033. The reversal of 121231302020020 is 20020203132121.

It is a self number, because there is not a number n which added to its sum of digits gives 121231302020020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23864426992 + ... + 23864432071.

It is an arithmetic number, because the mean of its divisors is an integer number (10691264430336).

Almost surely, 2^{121231302020020} is an apocalyptic number.

121231302020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121231302020020 is an abundant number, since it is smaller than the sum of its proper divisors (135359044308044).

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

121231302020020 is a wasteful number, since it uses less digits than its factorization.

121231302020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47728859199 (or 47728859197 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 121231302020020 its reverse (20020203132121), we get a palindrome (141251505152141).

The spelling of 121231302020020 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, three hundred two million, twenty thousand, twenty".