20120221000100 has 72 divisors (see below), whose sum is σ = 48536163986688. Its totient is φ = 7189359350400.

The previous prime is 20120221000097. The next prime is 20120221000127. The reversal of 20120221000100 is 100012202102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249590234 + ... + 249670833.

It is an arithmetic number, because the mean of its divisors is an integer number (674113388704).

Almost surely, 2^{20120221000100} is an apocalyptic number.

20120221000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120221000100 is an abundant number, since it is smaller than the sum of its proper divisors (28415942986588).

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

20120221000100 is a wasteful number, since it uses less digits than its factorization.

20120221000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499261125 (or 499261118 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20120221000100 its reverse (100012202102), we get a palindrome (20220233202202).

The spelling of 20120221000100 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, one hundred", and thus it is an aban number.