2121212110020 has 48 divisors (see below), whose sum is σ = 5939842413120. Its totient is φ = 565613847936.

The previous prime is 2121212110019. The next prime is 2121212110033. The reversal of 2121212110020 is 200112121212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529642 + ... + 2126721.

It is an arithmetic number, because the mean of its divisors is an integer number (123746716940).

Almost surely, 2^{2121212110020} is an apocalyptic number.

2121212110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121212110020 is an abundant number, since it is smaller than the sum of its proper divisors (3818630303100).

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

2121212110020 is a wasteful number, since it uses less digits than its factorization.

2121212110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669684 (or 2669682 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121212110020 its reverse (200112121212), we get a palindrome (2321324231232).

The spelling of 2121212110020 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, twenty".