20121221300 has 36 divisors (see below), whose sum is σ = 43683037440. Its totient is φ = 8044804320.

The previous prime is 20121221249. The next prime is 20121221303. The reversal of 20121221300 is 312212102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221303) 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, 178967 + ... + 268833.

Almost surely, 2^20121221300 is an apocalyptic number.

20121221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121221300 is an abundant number, since it is smaller than the sum of its proper divisors (23561816140).

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

20121221300 is a wasteful number, since it uses less digits than its factorization.

20121221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92120 (or 92113 counting only the distinct ones).

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

Adding to 20121221300 its reverse (312212102), we get a palindrome (20433433402).

The spelling of 20121221300 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, three hundred".