2121100220020 has 12 divisors (see below), whose sum is σ = 4454310462084. Its totient is φ = 848440088000.

The previous prime is 2121100220017. The next prime is 2121100220039. The reversal of 2121100220020 is 200220011212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1657486304356 + 463613915664 = 1287434^2 + 680892^2 .

It is a super-2 number, since 2×2121100220020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 53027505481 + ... + 53027505520.

It is an arithmetic number, because the mean of its divisors is an integer number (371192538507).

Almost surely, 2^{2121100220020} is an apocalyptic number.

2121100220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121100220020 is an abundant number, since it is smaller than the sum of its proper divisors (2333210242064).

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

2121100220020 is a wasteful number, since it uses less digits than its factorization.

2121100220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106055011010 (or 106055011008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2121100220020 its reverse (200220011212), we get a palindrome (2321320231232).

The spelling of 2121100220020 in words is "two trillion, one hundred twenty-one billion, one hundred million, two hundred twenty thousand, twenty".