121212310020 has 24 divisors (see below), whose sum is σ = 339394468224. Its totient is φ = 32323282656.

The previous prime is 121212309961. The next prime is 121212310049. The reversal of 121212310020 is 20013212121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010102524 + ... + 1010102643.

It is an arithmetic number, because the mean of its divisors is an integer number (14141436176).

Almost surely, 2^121212310020 is an apocalyptic number.

121212310020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212310020 is an abundant number, since it is smaller than the sum of its proper divisors (218182158204).

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

121212310020 is a wasteful number, since it uses less digits than its factorization.

121212310020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020205179 (or 2020205177 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121212310020 its reverse (20013212121), we get a palindrome (141225522141).

The spelling of 121212310020 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred ten thousand, twenty".