1200000021103 has 16 divisors (see below), whose sum is σ = 1358196456960. Its totient is φ = 1051909223904.

The previous prime is 1200000021091. The next prime is 1200000021107. The reversal of 1200000021103 is 3011200000021.

It is not a de Polignac number, because 1200000021103 - 2⁵ = 1200000021071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200000021103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200000021107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14395051 + ... + 14478172.

It is an arithmetic number, because the mean of its divisors is an integer number (84887278560).

Almost surely, 2^{1200000021103} is an apocalyptic number.

1200000021103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1200000021103 is a deficient number, since it is larger than the sum of its proper divisors (158196435857).

1200000021103 is a wasteful number, since it uses less digits than its factorization.

1200000021103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28873398.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 1200000021103 its reverse (3011200000021), we get a palindrome (4211200021124).

The spelling of 1200000021103 in words is "one trillion, two hundred billion, twenty-one thousand, one hundred three".