20121221230 has 128 divisors (see below), whose sum is σ = 41699266560. Its totient is φ = 6924464640.

The previous prime is 20121221161. The next prime is 20121221249. The reversal of 20121221230 is 3212212102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56047791 + ... + 56048149.

It is an arithmetic number, because the mean of its divisors is an integer number (325775520).

Almost surely, 2^20121221230 is an apocalyptic number.

20121221230 is an abundant number, since it is smaller than the sum of its proper divisors (21578045330).

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

20121221230 is a wasteful number, since it uses less digits than its factorization.

20121221230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121221230 its reverse (3212212102), we get a palindrome (23333433332).

The spelling of 20121221230 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty".