2121123221300 has 36 divisors (see below), whose sum is σ = 4609117000236. Its totient is φ = 847291756800.

The previous prime is 2121123221297. The next prime is 2121123221323. The reversal of 2121123221300 is 31223211212.

It can be written as a sum of positive squares in 6 ways, for example, as 59561378704 + 2061561842596 = 244052^2 + 1435814^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14395481 + ... + 14542080.

Almost surely, 2^{2121123221300} is an apocalyptic number.

2121123221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121123221300 is an abundant number, since it is smaller than the sum of its proper divisors (2487993778936).

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

2121123221300 is a wasteful number, since it uses less digits than its factorization.

2121123221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28938308 (or 28938301 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 2121123221300 its reverse (31223211212), we get a palindrome (2152346432512).

The spelling of 2121123221300 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred".