20001220210103 has 4 divisors (see below), whose sum is σ = 21819512956488. Its totient is φ = 18182927463720.

The previous prime is 20001220210019. The next prime is 20001220210123. The reversal of 20001220210103 is 30101202210002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20001220210103 - 2²⁰ = 20001219161527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001220210123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909146373176 + ... + 909146373197.

It is an arithmetic number, because the mean of its divisors is an integer number (5454878239122).

Almost surely, 2^{20001220210103} is an apocalyptic number.

20001220210103 is a deficient number, since it is larger than the sum of its proper divisors (1818292746385).

20001220210103 is a wasteful number, since it uses less digits than its factorization.

20001220210103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818292746384.

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

Adding to 20001220210103 its reverse (30101202210002), we get a palindrome (50102422420105).

The spelling of 20001220210103 in words is "twenty trillion, one billion, two hundred twenty million, two hundred ten thousand, one hundred three".