2121223100 has 36 divisors (see below), whose sum is σ = 4611439224. Its totient is φ = 846943680.

The previous prime is 2121223087. The next prime is 2121223103. The reversal of 2121223100 is 13221212.

It is a happy number.

It is a super-2 number, since 2×2121223100² = 8999174879947220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121223103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36659 + ... + 74741.

It is an arithmetic number, because the mean of its divisors is an integer number (128095534).

Almost surely, 2^2121223100 is an apocalyptic number.

2121223100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121223100 is an abundant number, since it is smaller than the sum of its proper divisors (2490216124).

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

2121223100 is a wasteful number, since it uses less digits than its factorization.

2121223100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38654 (or 38647 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2121223100 is about 46056.7378349792. The cubic root of 2121223100 is about 1284.8786594281.

Adding to 2121223100 its reverse (13221212), we get a palindrome (2134444312).

The spelling of 2121223100 in words is "two billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred".