2121220202120 has 16 divisors (see below), whose sum is σ = 4772745454860. Its totient is φ = 848488080832.

The previous prime is 2121220202117. The next prime is 2121220202161. The reversal of 2121220202120 is 212020221212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2058519040516 + 62701161604 = 1434754^2 + 250402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26515252487 + ... + 26515252566.

Almost surely, 2^{2121220202120} is an apocalyptic number.

2121220202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121220202120 is an abundant number, since it is smaller than the sum of its proper divisors (2651525252740).

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

2121220202120 is a wasteful number, since it uses less digits than its factorization.

2121220202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53030505064 (or 53030505060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2121220202120 its reverse (212020221212), we get a palindrome (2333240423332).

The spelling of 2121220202120 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred twenty".