20120220012100 has 36 divisors (see below), whose sum is σ = 47019406462084. Its totient is φ = 7429004311680.

The previous prime is 20120220012031. The next prime is 20120220012131. The reversal of 20120220012100 is 121002202102.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 29816310276 + 20090403701824 = 172674^2 + 4482232^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7738544859 + ... + 7738547458.

Almost surely, 2^{20120220012100} is an apocalyptic number.

20120220012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120220012100 is an abundant number, since it is smaller than the sum of its proper divisors (26899186449984).

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

20120220012100 is a wasteful number, since it uses less digits than its factorization.

20120220012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15477092344 (or 15477092337 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20120220012100 its reverse (121002202102), we get a palindrome (20241222214202).

The spelling of 20120220012100 in words is "twenty trillion, one hundred twenty billion, two hundred twenty million, twelve thousand, one hundred".