20103121220100 has 72 divisors (see below), whose sum is σ = 60693945130560. Its totient is φ = 5127752657280.

The previous prime is 20103121220099. The next prime is 20103121220107. The reversal of 20103121220100 is 102212130102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20103121220100.

It is not an unprimeable number, because it can be changed into a prime (20103121220107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1456741015 + ... + 1456754814.

Almost surely, 2^{20103121220100} is an apocalyptic number.

20103121220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20103121220100 is an abundant number, since it is smaller than the sum of its proper divisors (40590823910460).

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

20103121220100 is a wasteful number, since it uses less digits than its factorization.

20103121220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913495869 (or 2913495862 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20103121220100 its reverse (102212130102), we get a palindrome (20205333350202).

The spelling of 20103121220100 in words is "twenty trillion, one hundred three billion, one hundred twenty-one million, two hundred twenty thousand, one hundred".