21012200103 has 8 divisors (see below), whose sum is σ = 28017852016. Its totient is φ = 14007340800.

The previous prime is 21012200101. The next prime is 21012200119. The reversal of 21012200103 is 30100221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21012200103 - 2¹ = 21012200101 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 (21012200101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133258 + ... + 244503.

It is an arithmetic number, because the mean of its divisors is an integer number (3502231502).

Almost surely, 2^21012200103 is an apocalyptic number.

21012200103 is a deficient number, since it is larger than the sum of its proper divisors (7005651913).

21012200103 is a wasteful number, since it uses less digits than its factorization.

21012200103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396305.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21012200103 its reverse (30100221012), we get a palindrome (51112421115).

The spelling of 21012200103 in words is "twenty-one billion, twelve million, two hundred thousand, one hundred three".