2121212011220 has 24 divisors (see below), whose sum is σ = 4454717454600. Its totient is φ = 848451998592.

The previous prime is 2121212011211. The next prime is 2121212011273. The reversal of 2121212011220 is 221102121212.

It can be written as a sum of positive squares in 4 ways, for example, as 11554530064 + 2109657481156 = 107492^2 + 1452466^2 .

It is a congruent number.

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, 1516775 + ... + 2557934.

It is an arithmetic number, because the mean of its divisors is an integer number (185613227275).

Almost surely, 2^{2121212011220} is an apocalyptic number.

2121212011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121212011220 is an abundant number, since it is smaller than the sum of its proper divisors (2333505443380).

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

2121212011220 is a wasteful number, since it uses less digits than its factorization.

2121212011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100747 (or 4100745 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121212011220 its reverse (221102121212), we get a palindrome (2342314132432).

The spelling of 2121212011220 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, eleven thousand, two hundred twenty".